# Mole Essays & Research Papers

## Best Mole Essays

• The Mole - 467 Words
THE MOLE A mole (symbol Mol) is the base unit of quantity of a substance in the metric system. A mole is the quantity of a substance that contains 6.02 x 1023 units. A "unit" is the smallest measurable entity in the substance, generally either an atom or a molecule. The number of units in a mole was determined by Italian chemist (a scientist specializing in the composition, structure, properties, and reactions of matter) Amedeo Avogadro (1776-1856), one of the founders of modern physical...
467 Words | 2 Pages
• Moles: Mole and Formula Units
***ANSWERS*** CP Chemistry Mole Review Practice Problems Find the mass of 0.89 mol of calcium chloride. 0.89mol x 111 g / 1 mol = 98.8 g Determine the number of moles of C5H12 that are in 362.8g of the compound. 362.8g x 1 mol / 72 g = 5.04 mol Find the mass of 0.159 mol of silicon dioxide. 0.159 mol x 60 g / 1 mol = 9.54 g You are given 12.35 g of C4H8O2. How many moles of the compound do you have? 12.35 g x 1 mol / 88 g =...
330 Words | 2 Pages
• Mole Concept - 365 Words
MOLE – Chemical unit of amount * Refers to the amount of a substance which contains the same number of pieces as there are the number of atoms of Carbon in 12 grams of C12 12 grams C12 = 6.02 x 1023 atoms of Carbon = 1 mole 1 mole any substance = 6.02 x 10 23 pieces 1 mole of O atoms = 6.02 x 10 23 O atoms 1 mole Na atoms = 6.02 x 10 23 Na atoms 1 mole of H2O = 6.02 x 10 23 H2O molecules 1 mole of apples = 6.02x 1023 apples Molar Mass – mass in grams of 1 mole of a substance...
365 Words | 2 Pages
• Avogadro Constant and Mole Project Mole
Mole Project Mole S‘Mole... What‘s is it all about 1.Find and record two definition of mole wich are science related? Definition 1: a chemical mass unit, defined to be 6.022 x 1023 molecules, atoms, or some other unit. The mass of a mole is the gram formula mass of a substance. Definition 2: A small congenital growth on the human skin, usually slightly raised and dark and sometimes hairy, especially a pigmented nevus. 2.Wich of these moles are studied in Chemistry? The first of the...
740 Words | 3 Pages
• ## All Mole Essays

• Mole and Formula - 791 Words
AKS Review: Moles AKS Correlation 9c. Apply concepts of the mole and Avogadro’s number to conceptualize and calculate: -empirical/molecular formulas -mass, moles, and molecules relationships In all calculations that follow, SHOW ALL WORK AND USE SIGNIFICANT FIGURES. 1. Write Avogadro’s number in standard and in scientific notation. 2. What is a mole? 3. (a) In your own words, what is molar mass? (b) Find the molar mass of the following: Fe...
791 Words | 5 Pages
• The Mole Concept - 734 Words
Shawn Dubbs Lab 1 The Mole Concept of and the Chemical Formula of a Hydrate Abstract: The objective of this lab was to conduct an experiment to analyze the molar components in alum. This was conducted by heating the alum till the water had evaporated and then determining the number of moles for each component. Then using the these amounts to figure out the empirical formula for alum. Results: In order to determine how much of each separate component a total mass was taken before hand...
734 Words | 3 Pages
• Mole Examples - 485 Words
Mole Examples (Avogadro’s Revenge) 1. 2. 3. 4. 5. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 23​ Astronomers estimate that there is a mole (6.02 x 10​ ) of stars in the universe. One mole of high school chemistry textbooks would cover the USA to a depth of about 320 km (200 miles). Water flows over Niagara Falls at about 650,000 kL (172,500,000 gallons) per minute. At this rate it would take 134,000 years for one mole of water 23​ drops (6.02 x 10​ drops) to flow over Niagara Falls. ...
485 Words | 2 Pages
• Mole and Possible Conversion Factors.
S. 5.2 – The Mole The mole: - - - - Ex. - Molar mass (g/mol): - - - Ex. |Element |Atomic mass shown on Periodic |Molar mass of element | | |table | | |N |14.0067 |14.0067 g...
733 Words | 5 Pages
• Mole and Molar Concentration - 920 Words
Chapter 3 Important Chemical Concepts: Expressing Quantities and Concetrations I. Important Units of Measurement A. SI Units (International System of Units) SI Base Units Physical Quantity Name of Unit Abbreviation Mass kilogram kg Length meter m Time second s Temperature kelvin K Amount of substance mole mol Electric Current ampere A Luminous Intensity candela cd Prefixes for Units giga- G 109 mega- M 106 kilo- k 103...
920 Words | 6 Pages
• Mole Lab Exercise - 944 Words
Name Mole Lab Exercises I. Pre Lab Questions Answer the following questions. (Hint: Your textbook will be helpful.) 1. ‘s number is the number of carbon atoms that are present in 12 g of 12C. 2. How many molecules of a compound are in one mole of that compound? 3. Write out the formula for finding percent by mass. 4. Write out the formula for finding Molarity. 5. The Formula Weight of a compound is equal to mole of that compound....
944 Words | 4 Pages
• Mole Ratio of Chemical Reactions
Mole Ratio of a Chemical Reaction: Copper & Silver Nitrate Lab #4 OBJECTIVE In this experiment, you will determine the number of moles of reactants and products present in the reaction of copper and silver nitrate, and calculate their mole-to-mole ratio. The mole-to-mole ratio relating to the disappearance of copper and the formation of silver metal will be used to write the balanced equation for the reaction. The reaction of copper metal with silver nitrate solution is a...
1,337 Words | 7 Pages
• numericals on mole concept - 3072 Words
﻿1 mole of any substance can be defined as: Amount of a substance that contains as many particles (atoms, molecules or ions) as there are atoms in 12 g of the 12C isotope Avogadro number or Avogadro constant (NA); equal to 6.022 × 1023 particles Example − 1 mole of oxygen atoms = 6.022 × 1023 atoms 1 mole of carbon dioxide molecules = 6.022 × 1023 molecules 1 mole of sodium chloride = 6.022 × 1023 formula units of sodium chloride Molar mass of a substance can be defined as: Mass of one...
3,072 Words | 21 Pages
• Mole Math 2 - 473 Words
﻿WS 3.1 The Mole 1. Describe/relate the size of the mole to an everyday object. 2. What is Avogadro’s Number? 3. How many marbles are in a mole of marbles? 4. How many mosquitoes are in a mole of mosquitoes? WS 3.2 Molar Mass Find the molar mass of the following compounds: Show work and include units 1. CO2 2. 3. 4. 5. Fe2O3 6. 7. 8. 9. AgCl 10. 11. 12. 13. Ca3(PO4)2 14. 15. 16. 17. W3(PO3)5 18. 19. 20. 21. Fe(C2H3O2)2 22. 23. 24. 25. Calcium Carbonate 26....
473 Words | 4 Pages
• Chlorine and Mole Ratios - 251 Words
ractice Problem #1: Oxygen gas can be produced by decomposing potassium chlorate using the reaction below. If 138.6 g of KClO3 is heated and decomposes completely, what mass of oxygen gas is produced? KClO3 (s) --> KCl (s) + O2 (g) [unbalanced] Answer to Practice Problem #1: 1. Balance your equation first. 2KClO3 (s) --> 2KCl (s) + 3O2 (g) [balanced] 2. Convert from grams to moles using molar mass....
251 Words | 2 Pages
• Stoichiometry: Mole and Final Answer
For those of you who came to the review in class today, The stoichiometry question from class. I read the answer to the wrong decimal place. --What is the total mass of oxygen in 0.26mol of Cu2O? Find the percent of oxygen in Cu2O first. The molar mass of Cu2O is 143, the mass of just the oxygen in it is 16. % Composition of oxygen would be 16/143 times 100 is 11.19%, To determine the mass of Cu2O in 0.26 mol, multiply by the molar mass of Cu2O. This gives...
312 Words | 2 Pages
• Lab Mole Spoon - 330 Words
Name _________________________________________ Date ______________ Period ______________ Chemistry Lab Mole: Measuring Mass as a Means of Counting Purpose: Determine the number of atoms that fit on one tea spoon. 1. Use one clean and dry 50 mL beaker. Place on a balance and press the zero button until the display shows 0.00. 2. Place one level teaspoon of sodium chloride (NaCl) into the beaker, determine the mass and record in the table (row 1). 3. Repeat steps 1-2 for CaCO3 4. Repeat steps...
330 Words | 3 Pages
• MOLE UNIT REVIEW WKST Answers
﻿MOLE UNIT REVIEW WORKSHEET 1. Convert 500.0 g NaCl to formula units. 5.15 x 1024 f.u. Convert 9.8 x 1024 molecules of C2H6 to grams. 4.9 x 102 g The mass of an unknown gas is 11.59 g. The mass of an equal volume of He is 1.45 g. Calculate the molar mass of the unknown gas. 32.0 g/mol Calculate the percentage composition of sulphur in Al2(SO4)3. 28.11% Calculate the molar mass of Co2(SO4)3•6H2O 514.16 g/mol The empirical formula for a compound is C2H5O and its molecular...
753 Words | 3 Pages
• Determine the moles of water in copper sulcate
﻿Data Collecting and Processing Raw data Table of raw data Qualitative observation: At the start of the experiment, the crystals were blue. During the heating, the crystals turned white which means that they lost their water molecules. The source of hydrated copper sulphate consists of both small grains and large grains of the salt. Therefore during the heating process, the smaller grains of the hydrated salt turned from blue to white in just 1 minute. In other words, there is an uneven...
639 Words | 4 Pages
• Finding the Ratio of Moles of Reactants in a Chemical Equation
Finding the Ratio of Moles of Reactants in a Chemical Reaction Purpose: The goal of the lab is to determine the mole ratio of two reactants in a chemical reaction (AgNO3 and K2CrO4). However, the formulas for the products are unknown. Introduction: When determining the molar ratio of a chemical equation, usually the formulas of the reactants and the products are known. With that information, it is particularly easy to determine the ratio. However, since the products and the formulas...
722 Words | 3 Pages
• Finding the Ratio of Mole of Reactants in a Chemical Reaction
Title: Finding the Ratio of Mole of Reactants in a Chemical Reaction Purpose of Lab: To find the coefficients of two chemical reactants that appears in a balanced chemical equation using the continuous variations method. Pre Lab Questions: 1. 2AgNO3(aq) + K2CrO4(aq) → 2KNO3(aq) + Ag2CrO4(s) 2. There is enough to make a valid conclusion because, on the graph, one can clearly see that the two lines intersect. Thus, one can also determine the mole ratio. The mole ratio is...
1,033 Words | 4 Pages
• Determining the Number of Moles of Water of Crystallization Associated With One Mole of Copper (II) Sulfate in a Hydrate CuSO4 * xH2O (s).
INTRODUCTION Many salts that have been crystallized from water solutions appear to be perfectly dry, yet when heated they discharge large quantities of water. An example can be hydrated copper (II) sulfate. Exactly this salt is used in the described experiment. RESEARCH QUESTIONWhat is the number of moles of water of crystallization associated with one mole of copper (II) sulfate, in the hydrate CuSO4 * xH2O (s)? The independent variable in this experiment is sample thermal treatment ( heating...
1,767 Words | 5 Pages
• magnesium oxide report chemistry experiment empirical mole formula molar mass
﻿CHEMISTRY EXPERIMENTAL REPORT SALLY LI INTRODUCTION: In chemistry, compounds can be distinguished by using the empirical formula. The formula provides the simplest positive integer ratio of elements in a compound. The empirical formula is largely useful in determining the ratio of elements within ionic compounds where the structure is of a non-directional nature of bonding where any ion at any time could be...
2,783 Words | 9 Pages
• Using Method of Continuous Variations to Determine Mole Ratio of Reactants
﻿ Using the Method of Continuous Variations to Determine the Mole Ratio between Reactants Abstract: The purpose of this lab was to find the molar ratio of NaClO and an unknown substance labeled solution “B”. Using the method of continuous variation the ratio of the two solutions were changed but kept equal to 50 mL. The reaction was an exothermic oxidation-reduction and the temperature change was measured to determine which ratio of NaClO to solution “B” was optimal. The ratio with the...
551 Words | 2 Pages
• i dont know - 731 Words
﻿1. The mole is a counting unit of chemistry that denotes a specific amount 2. Avogadro created this unit 3. He used 12 grams of carbon to figure out his unit, weighed out 12 grams and did multiple test calculations 4. Abbreviation for the mole is mol 5. Avogadro’s number is 6.022 x 10^23 6. 1 mole= 6.022 x 10^23 7. Avogadro used the number to create molar mass 8. Molar mass is the weight of an atom in 1 mol, g/mol is the unit 9. MM is the abbreviation for molar mass 10. A mole is...
731 Words | 2 Pages
CHEMISTRY I Experiment 12: Avogadro's number (hand out) Introduction: The objective of this experiment is to determine the value of Avogadro's number and the mole concept via the use of the monolayer experiment. Experimental data sheet: Attached Calculations: 1. Area of monolayer A= 3.14(8.58 cm)² / 4 A= 231 cm² / 4 A = 57.8 cm² 2. Molecules of stearic acid in monolayer 57.8 cm² x 1molecule = 2.8 x 1016 molecules 2.1 x 10-15 cm²...
408 Words | 3 Pages
• Analysis of Alum Lab - 1576 Words
AP Chemistry Analysis of Alum * Purpose: * In this lab we performed several tests to determine if our crystals were actually aluminum potassium sulfate. * Procedures: * Materials: * Chemicals: * Aluminum potassium sulfate, 2.5 g * Equipment – Part 1: * 150 mL beaker * Bunsen burner * 2 capillary tubes * Mortar and pestle * Notched stopper to hold thermometer...
1,576 Words | 6 Pages
• Lab Avogadro's No - 264 Words
Worksheet for determination of Avogadro’s Number Trial 1 Trial 2 Number of drops per mL from pipet 46 drops 50 drops Average number of drops per ml 48 drops Vol. per drops of ethanol 0.02 mL Vol. of oleic acid per drop of ethanol solution 0.0001 mL Density of oleic acid 0.895 g/cm^3 Grams of oleic acid M= D x V M= 0.0179 g Grams of oleic acid per drop of ethanol solution M= D x V 8.95*10^-5 g Diameter of circle formed: Circle A 1.5 cm 1.1 cm 1.7 cm Circle B 1.2 cm 1.1 cm 0.9...
264 Words | 1 Page
• Myp Popcorn Lab - 1165 Words
Science 10 MYP Popcorn Lab Experimental Design We’ve been hired by Mr. Redenbacher to find a quick and accurate way to find the number of popcorn kernels in a bag of popcorn kernels without having to count them individually. We can apply our knowledge of solving problems involving the mole to find the number of popcorn kernels in the bag. Variables: Manipulated: Weight of Kernels. Controlled: Plastic Bag, Scale. Responding: The Weight of the kernels in grams, the number of...
1,165 Words | 4 Pages
• Experiment 6- Empircical Formula of a Compound
EXPERIMENT 6 – Empirical Formula of a Compound INTRODUCTION Chemical formulas indicate the composition of compounds. A formula that gives only the simplest ratio of the relative number of atoms in a compound is the empirical formula or simplest formula. The ratio usually consists of small whole numbers. We call a formula that gives the actual numbers of each type of atom in a compound the molecular formula. The numbers in a molecular formula will be whole number multiples of the numbers in an...
1,911 Words | 7 Pages
• Condumetric and Gravemetric Lab Report
Conductimetric Titration and Gravimetric Determination of a Precipitate Objective: * Measure the conductivity of the reaction between sulfuric acid and barium hydroxide * use conductivity values to determine equivalence point * measure mass of a product to determine equivalence point gravimetrically * calculate molar concentration of barium hydroxide solution Procedure: * First, combine 10.0 mL of the Ba(OH)2 solution with 50 mL of distilled water. Then, measure out 60 mL...
602 Words | 3 Pages
• Shazam - 495 Words
Chemistry Help! Could someone please help me with these chemistry problems. I am so lost. Thanks!? You mix 4.0 mL of 0.50 M Cu(NO3)2 with 3.0 mL of 0.50 M KI, and collect and dry the CuI precipitate. Calculate the following: Moles of Cu(NO3)2 used: Moles of KI used: Moles of CuI precipitate expected from Cu(NO3)2. Moles of CuI precipitate expected from KI. What mass of CuI do you expect to obtain from this reaction? If the actual mass of the precipitate you recover is 0.11 g,...
495 Words | 2 Pages
• As Transitions Measuring Amount of Substance Enthalpy Changes
AS TRANSITION COURSE SUMMER 2012 PART 1: MEASURING AMOUNT OF SUBSTANCE MASS VOLUME MOLAR MASS AVOGADRO [pic] CONCENTRATION ATOM ION MOLECULE COURSE OUTLINE OCR Chemistry A Unit 1 – Autumn Term 2012 • Atoms and Electron Structure • Moles, Equations and Acids • Structure and Bonding • Redox, Group 2 and Group 7 Unit 1 Exam – January 2013 – 1 hour – 90 UMS – 30% of total Unit 2 – Spring Term 2013 • Basic...
871 Words | 6 Pages
• Developing A Model Airbag ATDP 2014
﻿Developing a Model Airbag Lucy Peng Methods: To begin the experiment, my partner and I brainstormed several different airbag model designs: the first model containing a barrier of some sort to separate the NaHCO3 and the CH3COOH (Model 1) and the second model containing a “cup” or “pocket” taped to the wall of the plastic bag that would prevent the reactants form coming into contact (Model 2). We then measured arbitrary amounts of NaHCO3 using plastic weighing boats and an electronic scale....
1,547 Words | 5 Pages
• Food Engineering - 679 Words
Fundamental of Engineering Calculation 1. Determine the following unit conversions to SI units: a. Density value of 60 lbft3 to kgm3, Ans: 961.1 kg/m3 b. Energy value of 1.7 ×103Btu to kJ, Ans: 1.8 x 103 kJ c. Enthalpy value of 2475 BtulbtokJkg, Ans: 5756 kJ/kg d. Pressure value of 14.69 psig to kPa, Ans: 201.88 kPa e. Viscosity value of 20 cp to Pa∙s, Ans: 2 x 10-2 Pa∙s Table of Conversion Factor 1 lb | 0.454 kg...
679 Words | 3 Pages
• Hydrate Composition - 1334 Words
ABSTRACT By calculating the difference in the mass of the hydrate copper (II) sulfate and the anhydride we were able to determine the mass of water in the hydrate. This information was then used to determine the empirical formula of the hydrate, defined as a compound formed by the addition of water to another molecule. In the first trial, the mass of water in the hydrate was determined to be 0.41 g, while in the second trial the mass of water was 0.52 g. Moles of water associated with a...
1,334 Words | 4 Pages
• titration - 4330 Words
﻿ Experiment 4 SOLUTION STOICHIOMETRY ACID-BASE TITRATIONS Determination of the Percent Acetic Acid in Vinegar Objectives: (1) To introduce and use the concept of solution stoichiometry (2) To specifically use solution stoichiometry to determine the percent of acetic acid in vinegar. (3) To prepare a standard solution by the method of titration. Consider the following balanced chemical equations: (1) HCl + NaOH ------> NaCl + HOH (2)...
4,330 Words | 20 Pages
• Hydrate Lab Report for Chemistry Lab
9-19-13 Dehydrating and Rehydrating a Hydrate Introduction The mass percent of water was determined using the mass of water and dividing it by the total mass of the hydrate and then multiplying that answer by 100%. The number of moles of water in a hydrate was determined by taking the mass of the water released and dividing it by the molar mass of water. The number of moles of water and the number of moles of the hydrate was used to calculate the ratio of moles of water to moles of the...
823 Words | 4 Pages
• General Chemistry I - 1591 Words
Test 2 Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Find the combination that will give a gas as a product A. AgNO3(aq) + NaI(aq) B. HCl(aq) + Na2CO3 (aq) C. MgCl2(aq) + K2CO 3 (aq) D. CaSO4 (aq) + (NH4)3 PO4(aq) 1) A) A B) C C) B D) D 2) 2) The balanced molecular equation for complete neutralization of H2 SO4 by KOH in aqueous solution is __________. A) 2H+ (aq) + 2OH-...
1,591 Words | 8 Pages
• apush - 488 Words
﻿Analysis of a Commercial Bleach Lab Guidelines Name, Exp. Name, Number, Date (we did lab), Partner(s) Purpose Compound Names, Formulas, and Molar Masses (5 used – no formula or molar mass for starch) Reactions (use the four listed on the front page of the lab) Procedure/Observations Include initial observations and final observations/odors, masses of KI… Results (Data Table) Make a table that has your data of KI masses, and the three volumes (from the three trials) needed to titrate...
488 Words | 2 Pages
• Yield Lab - 946 Words
Abstract: All the materials were measured and weighed. It was found in the experiment that the yield of copper hydroxide in 40%. Introduction: The copper (II) sulphate is then placed in 100 mL of distilled water. Then 20 mL of CuSO4 is measured and placed 100 mL of distilled water. This can later be weighed to determine the mol of CuSO4 and the mol/L concentration. Then this was used to find out how many mL of 0.5 NaOH solution is needed to react completely with all the copper...
946 Words | 5 Pages
• Stoichiometry-problems - 1583 Words
moles-stoichiometry-practice-problems Now you're ready to use what you know about conversion factors to solve some stoichiometric problems in chemistry. Almost all stoichiometric problems can be solved in just four simple steps: 1.Balance the equation. 2.Convert units of a given substance to moles. 3.Using the mole ratio, calculate the moles of substance yielded by the reaction. 4.Convert moles of wanted substance to desired units. These "simple" steps probably look complicated at...
1,583 Words | 7 Pages
• chem answers - 9185 Words
Worked solutions to student book questions Chapter 2 Analysis by mass Q1. a b Why was the soup sample in Worked Example 2.1 heated to 110°C? Why was it necessary to weigh the sample four times? A1. a b The soup was heated above 100°C to evaporate water from the sample. By repeatedly heating the sample until the mass remained unchanged, the analyst could be sure that all the water had been removed. Q2. Some laboratories use microwave ovens in place of conventional ovens to...
9,185 Words | 96 Pages
• Chem 1212k Lab Report
Deborah Bell April 17, 2012 Chemistry 1212K Lab Synthesis Report Introduction In this Chemistry Lab the main objective is to perform accurate chemical analysis for the quantity of elements and compounds in a sample. There will be a compound made then synthesized. The methods used were acid-base titrations, redox titrations, gravity filtration, and distillation. General conclusions included Procedures Weight of Crucibles 1. The first experiment is Preparation of a Cobalt...
1,333 Words | 5 Pages
• 03.09 Molar Mass of Compounds Honors
Title: 03.09 Molar Mass of Compounds: Determining the Formula of a Hydrate Purpose: To determine the formula of a hydrate. Materials: * crucible * Bunsen burner * balance * CuSO4 hydrate Procedure: 1. Measure the mass of the clean, empty crucible, record the mass. 2. Add one or two scoops of the hydrate to the crucible, record the mass. 3. Heat the crucible and hydrate above a Bunsen burner for at least ten minutes to make sure that all of the water...
445 Words | 2 Pages
• analysis of alum lab - 1065 Words
Analysis of Alum, AlK(SO4)2・12 H2O Partner: Cindy Date: Sep 15, 2011 Purpose: The purpose of this experiment is to verify the identity of the alum by finding the properties of the substance; melting point and mole ratio of the water to the anhydrous. Every substance has unique characteristics which help to determine the identity of it. The actual values of the properties can be compared to the experimental values. In real life, this can be used to determine the unknown medicines....
1,065 Words | 8 Pages
• Avogadros Number And Molar Mass Handout
﻿Avogadro’s Number and Molar Mass Handout Key 1. What is the coefficient for oxygen when the following equation is balanced using the lowest, whole numbered coefficients? ____ C3H8O(g) + ____ O2 (g) ____ CO2 (g) + ____ H2O(g) a) 3 b) 5 c) 7 d) 9 2. What is the sum of the coefficients when the following equation is balanced using the lowest, whole numbered coefficients? _____ PH3 (g) + _____ O2 (g) _____ P4O10 (s) + _____ H2O(g) a) 10 b) 12 c) 19 d) 22 3. What is the sum of the coefficients...
483 Words | 4 Pages
• Chemistry Fundamental Concepts - 1697 Words
Chapter two Review of fundamental Concepts Atomic weight The atomic weight of element: is the mass of an atom of that element based on a mass of exactly 12 to the carbon isotope C12. Molecular or formula weight It is the sum of atomic weights of the elements that constitute molecule of the substance i.e as given by the molecular formula. Mwt of water (H2O) =2(1.008) +1(16.00) =18.02 Mwt of hydrogen (H2) =2(1.008) =2.016 These weights are all relative to the mass of C12 atom as 12.000...
1,697 Words | 14 Pages
• Determination of the Equilibrium Constant of an Unknown
Determination of the Equilibrium Constant of an Unknown Ester Hydrolysis Reaction Abstract The experiments to follow determined that the equilibrium concentrations of the reaction: ester + water ↔ alcohol + acid, are equal to 0.0363 moles of ester, 0.2852 moles of water, and 0.0268 moles each of alcohol and acid. Using this information the equilibrium constant was determined to be 0.06938. 1. Introduction In this lab the equilibrium constant, Kc, for the acid catalyzed...
986 Words | 5 Pages
• Lab Report - The Stoichiometry of an Oxidation-Reduction Reaction
Purpose: To find number of moles of Fe+3 which react with one mole of NH3OH+ in order to partially balance the equation: NH3OH+ + 2Fe+3 "" ? + 2Fe+2 and to find the missing product. Procedure: H2C2O4 and H2SO4 were titrated with potassium permanganate. The molarity of the permanganate was then found because the molarity of the H2C2O4 and H2SO4 were already known. Then hydroxylammonium chloride and ferric sulfate and water was titrated with known potassium permanganate to get the molarity of the...
340 Words | 2 Pages
• Book 4A Ans - 17024 Words
﻿HKDSE CHEMISTRY – A Modern View (Second Edition) (Chemistry) Coursebook 4A Suggested answers Chapter 36 Rate of chemical reaction Page Number Class practice 1 Think about 5 Chapter exercise 5 Chapter 37 Factors affecting rate of reaction Class practice 11 Think about 14 Writing practice 14 Chapter exercise 14 Chapter 38 Molar volume of gases at room temperature and pressure (r.t.p.) Class practice 21 Self-test 24 Think about 26 Chapter exercise 27 Part exercise 34 Chapter 39 Dynamic...
17,024 Words | 77 Pages
• Calculation for Calorimetry - 340 Words
CALCULATIONS Determining the amount Limiting Reagent used. nlimiting reagent = Molarity x Volume or Mass / Molar Mass Example: Limiting reagent is 5mL of 1.0 M HCl nlimiting reagent = Molarity x Volume nlimiting reagent = (1.0 [mol/L]) x 0.005 [L]) = 0.005 mol Determining the qrxn and qcal. qrxn + qcal = 0 -qrxn = qcal qrxn = ΔHrxn x nlimiting reagent qcal = Ccal ΔT qrxn = - Ccal ΔT + mcsolid ΔT (note: only if there is a precipitate formed in the...
340 Words | 2 Pages
• Math in Uganda - 478 Words
Name: _______________________ Date: ______________ Stoichiometry Worksheet #1 Answers 1. Given the following equation: 2 C4H10 + 13 O2 ---> 8 CO2 + 10 H2O, show what the following molar ratios should be. a. C4H10 / O2 b. O2 / CO2 c. O2 / H2O d. C4H10 / CO2 e. C4H10 / H2O 2. Given the following equation: 2 KClO3 ---> 2 KCl + 3 O2 a. How many moles of O2 can be produced by letting 12.00 moles of KClO3 react? 18.0 mol O2 3. Given the following equation: 2 K + Cl2 ---> 2 KCl a. How...
478 Words | 2 Pages
• L; Kasdjfa; Lksdjfafadf - 508 Words
Molarity Worksheet #1 identifiera ____________________ 1. What does molarity mean? Number of moles of solute 1 liter solution 2. What is the molarity of a solution that contains 4.53 moles of lithium nitrate in 2.85 liters of solution? 4.53 mol LiNO3 = 1.59 M LiN03 2.85 L soln 3. What is the molarity of a solution that contains 0.00372 moles hydrochloric acid in 2.39 x 10-2 liters of solution?...
508 Words | 3 Pages
• Calculations For Expt - 282 Words
﻿Calculations for Expt. 23 Colligative Properties Part A : Objective: To determine the freezing point of the solvent naphthalene Mass of naphthalene used = (Mass of test tube + naphthalene) – (Mass of empty test tube) Freezing Point of naphthalene = is the temperature at longest plateau (flat line) on the graph ----------------------------------------------------------------------------------------------------------------------------------- Part B: Objective: To determine the Kf...
282 Words | 2 Pages
• Chapter 10 Study Guide Answers
1. Atomic masses are expressed on a scale based on the mass of what? Carbon-12 2. Name the unit used to express atomic masses of individual atoms. Grams or molar mass, gmm 3. Define formula mass. Sum of the atomic masses of all atoms in a compound 4. What do we call the number of atoms of an element equal to the number of atoms in exactly 12.0 grams of carbon-12? Mole or Avogadro’s number 5. How many atoms are in a sample of an element whose mass is numerically equal to the...
541 Words | 2 Pages
• lab rep - 7586 Words
﻿ A. INTRODUCTION Biochemistry is the chemistry of biological systems. The practical component of biochemistry is aimed at developing your interest in and understanding modern biochemical and molecular biological experimentation. The techniques learnt in the biochemistry lab will be applicable to all life sciences. THE OBJECTIVES OF THE BIOCHEMISTRY LABORATORY INCLUDE: (1) Learning the theory behind the techniques and biochemical pathways (2) Learning the physical skills and...
7,586 Words | 33 Pages
• % Mgo Determination - 653 Words
Vu Ngo % MgO Determination September 10, 2012 Procedure: Reference to lab manual Data: Mass of Na2EDTA∙2H2O, g | .9289 | Standardization of EDTA Solution | Trial 1 | Trial 2 | Final buret reading, EDTA (mL) | 18.5 | 36.7 | Initial buret reading, EDTA(mL) | 0.5 | 18.5 | Determination of % MgO of Unknown Unknown Number | 4J | | Sample 1 | Sample 2 | Sample 3 | Mass of sample (g) | 0.2135 | 0.2132 | 0.2139 | Final buret reading, EDTA (mL) | 73.5 | 74.2 | 74.2 |...
653 Words | 3 Pages
• Lab report - 384 Words
09/17/13 Che 102L Lab # 4 Molar Mass by Freezing Point in Anti-Freeze. Objective: to determine the freezing point of pure naphthalene, determine the molar mass of an unknown by measuring the freezing point depression of a solution of the unknown in naphthalene. Materials: Beakers 600 mL, 2-250 mL,Crystal Ice,20 g of NaCl,Stirring Rod,Thermometer,Foil, Water, 10 mL, Cylinder, 25 mL 100 mL Dropper, 2 Test Tubes. Procedure: Filled 600 mL beaker with ice, took temperature until it...
384 Words | 3 Pages
• Gen Chem Study Guide
A. WORK-OUT PROBLEMS: Write formulas for the following: calcium nitrate phosphorous pentafluoride aluminum carbonate strontium hydroxide methane potassium oxide lithium chloride barium sulfate phosphate ion dinitrogen tetroxide Give the complete electron configurations of: S, O2-, and Mn. For the following molecules/ions, give the Lewis structure, molecular geometry, and electron pair geometry: NO2- SF4 Write Lewis structures to represent all resonance forms of...
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• Research Paper on Determination of the Molar Volume of a Gas
Abstract: The objective of the experiment was to verify the molar volume of a gas and gas constant.¹ The method in which was used to determine the volume of H2 gas at standard temperature and pressure and the gas constant was to measure a strip of magnesium and place it inside the gas buret which contained hydrochloric acid, blue dye and distilled water and allow the reaction to occur. Once the reaction was complete and there were no visible gas bubbles, the volume was obtained and recorded....
1,457 Words | 4 Pages
• Molar Conversions - 942 Words
Mole Conversion Web Quest EO 103 What the heck is a mole? We have Avagadro ( and others) to thank for this…….. 6.02 x 1023 is the number of “things” per mole of the substance. Here is a tutorial for an over view and for a reference as you work through these problems http://www.wiley.com/college/chem/spencer053872/tutorial/gramsmoles/gramsmoles1.html We can use this to do mathematical conversions to determine mass, volume, and number of atoms or molecules in a given substance. For example...
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• Equilibrium constant - 738 Words
The Equilibrium Constant of an Ester Hydrolysis Reaction CHM 152LL Section 33263 March 28, 2014 John Weide Abstract: The purpose if this experiment is to determine the equilibrium constant of an unknown alcohol. In this experiment unknown alcohol number three and unknown ester number three were used. The equilibrium constant was found by titrating a series of reactions containing H2O, HCl, and the unknown ester with only the last solution containing the...
738 Words | 4 Pages
• Chem lab - 589 Words
Data Collection and Processing Aspect One -2.00grams of Sr(NO3)2 used -2.00grams of CuSO4 -Reactants: Sr(NO3)2 and CuSO4 Trial Mass of Beaker (g) Mass of Beaker with Sr(NO3)2 (g) Mass of Beaker (g) Mass of Beaker and CuSO4 (g) Mass of Filter Paper (g) Mass of Filter Paper and Contents (g) 1 111.08±0.01 113.08±0.01 111.1±0.01 113.1±0.01 1.28±0.01 2.93±0.01 2 111.1±0.01 113.1±0.01 111.23±0.01 113.23±0.01 1.27±0.01 2.98±0.01 3 111.26±0.01 113.26±0.01 111.09±0.01 113.09±0.01 1.27±0.01...
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• Gravimetric Analysis - 2870 Words
SINGAPORE POLYTECHNIC SCHOOL OF CHEMICAL & LIFE SCIENCES CP 4001: ANALYTICAL & PHYSICAL CHEMISTRY Experiment 4: Gravimetric Analysis Prepared for: Mr Goh Tong Hng Submitted by: Ng Hui Shan (0900931) DBS/FT/1A/02 26th May 2009 CONTENTS 1. Synopsis 3 2. Objectives 4 3. Theory 1. Experimental Procedure 4 2. Stoichiometric Calculation 7 4. Procedure 7 5. Results & calculations 1. Amount...
2,870 Words | 14 Pages
• Harcourt Essen Reaction - 1190 Words
Making up Hydrogen Peroxide Volume required 250 cm3 and concentration required 0.1 moldm-3 Given concentration of H2O2 = 1.7 moldm¬-3 Number of moles (n¬¬¬¬¬¬¬¬¬¬¬) = Concentration (moldm-3) x Volume (dm-3) = 0.1 x 0.25 = 0.025 mol Volume (dm-3) = Number of Moles (n) X 1000 Concentration (moldm-3) = (0.025/1.7) x 1000 = 14.7 cm3 Distilled water required: 250 cm3 –...
1,190 Words | 5 Pages
• Chemistry - 6617 Words
I. Grade Level/Unit Number: 9-12 Unit 7 II: Unit Title: Mole Concept III. Unit Length: 7 days (on a 90 min. per day block schedule) IV. Major Learning Outcomes: Students should be able to: Mole Concept • Calculate formula mass. • Convert representative particles to moles and moles to representative particles. (Representative particles are atoms, molecules, formula units, and ions.) • Convert mass of atoms, molecules, and compounds to moles and moles of...
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• CHEM 165 - 567 Words
CHM138LL Lab 5 Stoichiometry Analysis of a Chemical Reaction Name: A. Data Tables Item Measured/Quantity Calculated Mass (in grams) Iron nails (before reaction) 7.75g 5.5g Iron nails (after reaction) Mass of iron consumed 2.25g Initial mass of filter paper (before filtration) 0.86g 3.52g 2.66g Mass of filter paper and solid product Mass of solid product Show work below for “mass of iron consumed” and “mass of solid formed” calculations: 7.75g-5.5g=2.25g...
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• Lamarsh Solution Chapter 2
Lamarsh Solutions Chapter-2 2.5 This is a question of probability, For molecules which have an approximate weight of 2, there are two 1H and we can find the probability or the percentage over 1 as, 0.99985*0.99985=0.99970 The same calculation can be made for the mol. weights of 3 and 4 For 3 there are one 1H and one 2 H and so, 0.99985*0.00015=1.49e-4 For 4 there are two 2 H and so, 0.00015*0.00015=2.25e-8 2.7 From table of nuclides we can find the atomic weights of O and H using the abundances...
802 Words | 5 Pages
• Empirical Formula of a Compound - 414 Words
Empirical Formula of a Compound * Purpose: To determine the empirical formula of Magnesium Chloride. * Data 1. Mass of evaporating dish = 45.08g 2. Mass of evaporating dish and Magnesium = 45.17g 3. Mass of Magnesium: { 2 } – { 1 } = 0.09 4. Mass of evaporating dish and Magnesium Chloride First weighing = 45.48g (After heating and cooling) second weighing = 45.49g 5. Mass of Magnesium Chloride: { 4} – { 1 } =...
414 Words | 2 Pages
• pointless waste of time - 2770 Words
﻿ Topic 1.2 AMOUNT OF SUBSTANCE The mole Reacting masses and atom economy Solutions and titrations The ideal gas equation Empirical and molecular formulae Ionic equations Mill Hill County High School THE MOLE Since atoms are so small, any sensible laboratory quantity of substance must contain a huge number of atoms: 1 litre of water contains 3.3 x 1025 molecules. 1 gram of magnesium contains 2.5 x 1022 atoms. 100...
2,770 Words | 15 Pages
Online Coaching Courses | Online Tuition Classes | Effective Education M... http://www.topperlearning.com/student/question_bank_list/OTk= Exam Special --> Textbook Solutions Student's Corner Career Guide Study Material Sample Papers Solved Board Papers Topper News Testimonials Meet The Faculty Course Plan CBSE XI JEE Back to Dashboard Profile Setting Question Bank Hectic school hours AND tuitions, too! Feeling hassled? Don't fret! Our question bank will help you balance...
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• Friends and Family - 499 Words
Name: ____________________________________Period: _____ Date:____________ Lab 9: Formula of a Hydrate Lab Purpose: To utilize mole conversions to determine the ratio between copper (II) sulfate molecules and water of hydration. Materials: 1 Hot Plate 1 Wire Mesh 1 Small beaker 1 Glass Stirring Rod 1 Electronic Scale 1 Crucible Tong Copper II Sulfate Hydrate (approx. 5g) Procedure: 1. Mass small beaker (empty)...
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• Chem June Exam outline
Chemistry June Exam Notes Quantities in Chemical Reactions  Molecular and formula mass o The mass of one unit of a compound (a molecule or a formula unit) o The sum of the mass of all the atoms in a compound o With knowledge of the mass of each individual atom, the percentage composition by mass can be determined  The Mole (mol) o A counting unit, one mole refers to 6.02 x 1023 particles of any given substance o Known as Avogadro’s Constant and given the symbol NA  Molar Mass o The...
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• abortion - 278 Words
﻿ STOI 903 Laboratory Report To: Director City Forensics Laboratory From: Kevin Khong Chemistry 1141 Section – 028 Date: October 13, 2014 Re: Sanitation Worker Accident The analysis for Experiment 6: STOI 903 was conducted by Lindsey and I. The analysis was performed at Texas State University – San Marcos in the Chemistry lab. The concentrations used in the experiment were 0.5M of sodium hydroxide and 0.5M of sodium hypochlorite. The concentrations of the solutions found...
278 Words | 2 Pages
• Synthesis of Aspirin - 1897 Words
﻿Abstract: The purpose of this lab is to synthesise acetylsalicylic acid (aspirin) by creating a reaction between acetic anhydride and salicylic acid. This was be accomplished through the use of recrystallization. Acetic anhydride and salicylic acid are mixed together, and then acidified by the addition of a few drops of concentrated sulfuric acid, which catalyzed the reaction. The percent yield is calculated to determine the effectiveness of the reaction in preparing the desired product...
1,897 Words | 8 Pages
• Exp 10 Stoichiometry Lab Reportnew
﻿Lab Report for Experiment #10 Stoichiometry of a Precipitation Reaction Student's Name ____________________ Date of Experiment ___________ Date Report Submitted _________________ Title: Purpose: Instructor Changes: Weigh out about 1.7 g of CaCl2·2H2O and record your mass to +/- 0.1 g (for example 1.6 g, 1.7 g, or 1.8 g). We have made this change so that you will have 2 sig figs in subsequent calculations. Have you made any changes to the procedure? Please explain: Data Tables and...
505 Words | 3 Pages
• Gravimetric Analysis - 934 Words
Quantitative Determination of Gravimetric Analysis Ophelia Low Gek Suan 1311907DBT/FT/1A/01 | SYNOPSIS By gravimetric analysis, we are able to determine the amount of sulphate in barium sulphate quantitatively. We can do so by slowly adding dilute barium sulphate to an unknown sulphate solution that has been heated and acidified with concentrated hydrochloric acid slightly. A white precipitate will be yield from filtering the...
934 Words | 4 Pages
• Preparation of the NaOH Solution - 511 Words
﻿Preparation of the NaOH Solution Mass of NaOH before standing = NaOH before standing (g) – beaker (g) = 111.490 g – 110.970 g = 0.520 g Mass of NaOH after standing = NaOH after standing (g) – beaker (g) = 111.500 g – 110.970 g = 0.530 g Standardization of the NaOH solution TRIAL I Volume of NaOH solution = Final reading of buret - Initial reading of buret = 13.80 mL – 0.00 mL = 13.80 mL Converting the Volume (mL) to Volume (L) Volume (liters) = Volume (mL)...
511 Words | 4 Pages
• post lab of cucl2 - 732 Words
I. Title: Iron-Copper (II) Chloride Reaction II. Purpose: The purpose of this lab is to see how iron reacts with a copper (II) chloride solution. III. Equipment and Reagents Scoop copper (II) chloride (CuCl2) Beaker Iron (Fe) Wash Bottle water (H2O) Scale Hydrogen chloride (M HCl) Filter Paper IV. Procedure: 1. Obtain a clean, dry 250 mL beaker. 2. See teacher to obtain a scoop of CuCl2 in the beaker. 3. Add approximately 50 mL of tap...
732 Words | 4 Pages
• Practice Final - 1884 Words
Last Name ____________________First Name _______________________ Ignore: 5, 7, 19, 30 1. | How many grams of CaCl2 (molar mass = 111.0 g/mol) are needed to prepare 4.44 L of 0.500 M CaCl2 solution? | | A) 369 g B) 271 g C) 258 g D) 296 g E) 246 g | 2. | An aqueous solution of ammonium sulfate is allowed to react with an aqueous solution of lead(II) nitrate.The complete ionic equation contains which of the following species (when balanced in standard form)? | | A)...
1,884 Words | 8 Pages
• Chem Exam 2 - 1533 Words
xam 2 [pic] Summer 2011 Chemistry 1411 EXAM # 2 Activity Series of Metals in Aqueous Solution [pic] CHEM 1411 Exam # 2A Name:________________________________ (Chapters 4,5,6, and 7) Score: [pic] Part I- ( 3 points each) - Please write your correct answer next to each question number, DO NOT CIRCLE. ____ 1. Compare the rates of effusion of CO2 & SO2, rCO2/rSO2 A. CO2 will effuse 1.45 times...
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• Question Paper - 6076 Words
CHEMISTRY (Theory) Time allowed : 3 hours General Instructions: (i) All questions are compulsory. Maximum Marks : 70 (ii) Marks for each question are indicated against it. (iii) Question numbers 1 to 8 are very short-answer questions and carry 1 mark each. (iv) Question numbers 9 to 18 are short-answer questions and carry 2 marks each. (v) Question numbers 19 to 27 are also short-answer questions and carry 3 marks each. (vi) Question numbers 28 to 30 are long-answer questions and carry 5...
6,076 Words | 37 Pages
• Determining the Number of Water Molecules in a Hydrate
Determining the Number of Water Molecules in a Hydrate Results Mass of empty beaker 55.11 g Mass of beaker with hydrated copper (II) sulfate 58.13 g Mass of hydrated copper (II) sulfate 3.02 g Mass of beaker with dehydrated copper (II) sulfate (last weighing) 57.22 g Mass of dehydrated copper (II) sulfate 2.18 g Mass of dehydrated copper (II) sulfate (2nd weighing) 2.11 g Questions 1. Calculate the value of “n”. Show your work. Include an example of ALL calculations involving...
723 Words | 3 Pages
• Ideal Gas Law - 389 Words
Name of the Experiment: Avogadro’s Law Type Your Name: Date: 11/17/13 Experiment 1 ________________________________________ 1. For each gas, record the following: Propane Butane Methane a Name and formula C3H8 C4H10 CH4 b Mass of 100 mL gas (g) 0.274g 0.361g 0.100g c Molecular weight of the gas (g/mole) 44.10g/mol 58.12g/mol 16.04g/mol d Number of moles in the 100 mL sample 0.0062mol 0.0062mol 0.0062mol Average of all 3 gases:...
389 Words | 2 Pages
• Determination of Concentration of Potassium Hydroxide
Determination of Concentration of Potassium Hydroxide Weigh boat 0.87g Weigh boat + Sulphamic acid 3.29g Weigh boat after transfer 0.87g Sulphamic acid 2.42g | Trial | 1st | 2nd | 3rd | 4th | 5th | Start | 3.00 | 3.20 | 5.20 | 18.55 | 1.90 | 14.65 | Finish | 17.35 | 18.10 | 18.10 | 31.50 | 14.65 | 27.65 | Titre | 14.35 | 14.90 | 14.90 | 12.95 | 12.75 | 13.00 | Average titre = 12.90cm3 NH2SO3H + KOH – NH2SO3K + H20 Sulphamic Acid Standard Solution Moles from...
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• Lab 4 Weak Acid Unknown
﻿Gabi Mejia Chem 101 Section ADF Lab 4: Weak Acid Unknown Procedure: When testing the acid, use only between 0.2 g and 0.3 g for each trial (get as precise a measurement as you can). The general procedure is to weigh out your acid, dissolve it in water, add a couple drops of the indicator (phenolphthalein), and then add the sodium hydroxide until you note a color change (from clear to pink). When the color change occurs, you have added enough base to completely react with the acid (the...
304 Words | 2 Pages
• Volumetric Vinegar Analysis - 1316 Words
Experiment 9 and 10: Volumetric/Vinegar Analysis Abstract: The goal of the experiment that was conducted was to figure out both the molar concentration of NaOH and the standard mole ratio of the NaOH solution. In order to find the concentration of the NaOH solution, volumetric analysis was used. In volumetric analysis, a titration mechanism was utilized in order to find the reaction that the base will end up having with...
1,316 Words | 6 Pages
• Lab 3 CHEM2110 - 367 Words
﻿ Lab 3: Bromination of Acetanilide CHEM 2110 Hassan Alsaleh 0525970 Due date :11/02/2015 Q1: To find the limiting reagent we need to find the number of moles of acetanilide, and the number of moles of Bromine. Mass of Acetanilide used = 0.67g Molar mass of Acetanilide = 135.16g/mol[1] Number of moles of Acetanilide = (0.67g) / (135.16g/mol) = 0,005 mols Volume of Bromine = 0.25ml Density of Bromine = 3.103 g/ml[2] Mass of Bromine = (0.25ml) X (3.103g/ml) =...
367 Words | 2 Pages
• General Chemistry I: Problems and Solutions
CHM 134 General Chemistry I Quiz 3, Fall 2009 – Drs. Foy and Steel Name SOLUTIONS 1. ( 2 points) Calculate the number of moles in 0.41 g titanium. . . . 2. ( 2 points) What is the mass of 5.1 mol P? . . 3. ( 2 points) A 3.6 g sample of lithium contains how many atoms? . . . . 4. (4 points) The density of iron is 7.87 g/cm3. Calculate the number of iron atoms present in a cube that has an edge of 3.00 cm. . . . . . . . 5. (4 points) You...
307 Words | 6 Pages
• Preparation of sodium hexanitrocobaltate (III)
Chemistry 261 Practical Report Practical 2 Thermos Thurman 211526893   PRACTICAL 2: Preparation of sodium hexanitrocobaltate (III) Date: 12 March 2014 INTRODUCTION Sodium hexanitrocobaltate (III) is a coordination complex which has the formula Na3[Co(NO2)6]. This compound is yellow in colour. It consists of a central Co3+ ion surrounded by six nitro ligands [1]. This compound is used as a qualitative test for potassium and...
801 Words | 5 Pages
• Stoichiometry: Oxygen and Empirical Formula
﻿LEARNING TASK NO. 4B Composition Stoichiometry Problems Mole Relationship from Chemical Formulas: a) Determine the number of moles of chloride ions in 2.53 mol ZnCl2. b) Calculate the number of moles of each element in 1.25 mol glucose (C6H12O6). c) How many molecules of oxygen atoms are present in 5.00 mol diphosphorus pentoxide? d) Calculate the number of moles of hydrogen atoms in 11.5 mol water. e) A sample of ethanol (C2H5OH) has a mass of 45.6 g.How many carbon atoms does the...
290 Words | 1 Page
• Chem Empirical Formula of a Hydrate Formal Lab
Student: ​ Glavin Wiechert Group Member: Victoria Coe Due Date: May 2, 2011 Teacher: Louth, Ellen Mary Class: Chemistry 11 Ad Introduction: An empirical formula of a chemical compound is the ratio of atoms in simplest whole­number terms of each present element in the compound. For example, Glucose is C​ H​ O​ ; it’s empirical formula is CH​ O. 6​ 12​ 6​ 2​ ...
1,037 Words | 10 Pages
• Study Guide Stoichiometry Student Editable
﻿Stoichiometry Section 11.1 What is stoichiometry? In your textbook, read about stoichiometry and the balanced equation. For each statement below, write true or false. _______true___________ 1. The study of the quantitative relationships between the amounts of reactants used and the amounts of products formed by a chemical reaction is called stoichiometry. ________true__________ 2. Stoichiometry is based on the law of conservation of mass. _________false_________ 3. In any chemical reaction,...
1,503 Words | 8 Pages
• Chemistry 2202 Final Review
Chemistry 2202 Review Final Exam Chapter 2: The Mole 1. Isotope – atoms of an element that have the same number of protons but different numbers of neutrons. Ex. The three forms of oxygen are called oxygen-16, oxygen-17, and oxygen-18. They all have 8 electrons and are written as 16/8 O (8 protons + 8 neutrons), 17/8 O (8 protons + 9 neutrons), and 18/8 O (8 protons + 10 neutrons). 2. 3. Mass Number – the sum of the protons and neutrons in the nucleus of one atom of a...
1,725 Words | 7 Pages
• Course Notes - 1461 Words
• Mole Concept • Defining moles o 1 mole of molecules has a mass equal to the molecular weight in grams. o examples  1 mole H2O is the number of molecules in 18.015 g H2O  1 mole H2 is the number of molecules in 2.016 g H2. o 1 mole of atoms has a mass equal to the atomic weight in grams. o 1 mole of particles = 6.02214 x 1023 particles for any substance!  Prove this by converting 1 mole to grams to daltons to particles for any substance. • vocabulary o molar mass is the mass of...
1,461 Words | 5 Pages
• Antifreeze Lab - 400 Words
Finding the Freezing Point of Water and % Antifreeze Purpose The purpose of this experiment is to determine the freezing points of water, 10% antifreeze, and 20% antifreeze utilizing an ice bath and a really cool thermometer. Apparatus Procedures Preparing the Ice Bath 1. Fill the tub ¾ full with ice. 2. Cover the ice with a respectable amount of salt. 3. Add water and stir that bad boy, the water should be standard temperature in a fwe minutes. Fill the test tube with...
400 Words | 2 Pages
• Standardisation of Hydrochloric Acid Report
STANDARDISATION OF HYDROCHLORIC ACID REPORT Aim: To standardize an unknown solution of hydrochloric acid Method: See INSTRUCTIONS for practical 6.2 & 6.3 Results: Attempt No. | Titre (mL) | | 1 | 20.9 | Rough Titration | 2 | 20.5 | | 3 | 20.7 | Concordant Titres | 4 | 20.7 | | 5 | 20.7 | | (1) Tabled Results (2) Concordant Titrations Results 20.7 mL | 20.7 mL | 20.7 mL | Average of Concordant: (20.7 + 20.7 +20.7) 3= 20.7 mL Calculations:...
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• Chm1311 Experiment 1 - 2957 Words
EXPERIMENT 1 “HOW DO I LOVE THEE LET ME COUNT THE WAYS...” DETERMINATION OF AVOGADRO’S CONSTANT Techniques   Calibration drop counting MSDS available for • • stearic acid, CH3(CH2)16COOH cyclohexane, C6H12 Principles      molar volume molecular structures surface areas and volumes Avogadro’s constant percent error Recommended Advanced Reading  Chapter 3 in Petrucci, Herring, Madura, & Bissonnette’s General Chemistry,10th Ed. Avogadro Constant...1 INTRODUCTION...
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• Methyl Orange - 1152 Words
In this experiment the initial mass of the sodium carbonate used was 2.69g. In each titration, 3 drops of methyl orange was added to the sodium carbonate solution. With this information the titration can begin, and the results obtained are shown below: Titration readings Titration Rough 1 2 3 4 5 Initial 0.00 4.30 22.00 21.00 15.00 25.90 Final 4.30 22.00 38.60 37.60 32.60 42.20 Titre (cm3) 4.30 17.70 16.60 16.60 17.60 16.30 Therefore, the average titre would be calculated as follows;...
1,152 Words | 5 Pages
• Chemistry Notes - 1023 Words
Chemistry 200 Exam 1 Review Problems 1. Calculate the number of atoms in 10.0 grams of Fe. 2. Give the mass number, #protons, #neutrons and #electrons for the isotope strontium-88. 3. Calculate the number of moles of carbon in 50.0 g of benzene C6H6 4. A substance is found to be 38.7 % C, 9.7 % H and 51.6 % O by mass. Its molar mass is 62.1 g/mole. What is its molecular formula? 5. Name the following: a) Ca(OH)2 b) KCN c) HClO4(aq) d) FeSO4 e) Na2O f) SF6 g)...
1,023 Words | 5 Pages