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
  • Experiment 12: Avogadro's Number
    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
  • 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
  • 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
  • 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
  • % 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
  • 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
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