Heat of Combustion of Magnesium Background: The students were given full instructions on how to experimentally determine the enthalpy of reaction (ΔHrxn) for the combustion of magnesium ribbon‚ using Hess’s Law. Data Collection: | |Reaction 1 |Reaction 2 | | |(MgO) |(Mg)
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Module 1: Lesson 5 ASSIGNMENT (12 marks) Lesson 5 Assignment Part 1: Molar Heat Calculations (3 marks) 1. Calculate the molar enthalpy of the NaOH(aq) using the data obtained from this experiment. Show all your work. Answer: Specific heat capacity: 4.19 J/g∙°C 50.0 ml of 1.0 mol/L NAOH Initial temperature: 23.9 °C Final temperature: 32.9 °C Change in temperature: 9 °C Q = mc∆t = (80g)(4.19 J/g∙°C)(9°C) = 3016.8 J or 3.0168 kJ ∆rH = n∆rHm 3.0168 kJ = (0.05
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Table 17.2 Heats of Combustion at 25°C Substance ∆H (kJ/mol) Formula Hydrogen H2(g) Ϫ286 Carbon C(s)‚ graphite Ϫ394 Methane CH4(g) Ϫ890 Acetylene C2H2(g) Ϫ1300 Ethanol C2H5OH(l) Ϫ1368 Propane C3H8(g) Ϫ2220 Glucose C6H12O6(s) Ϫ2808 Octane C8H18(l) Ϫ5471 Sucrose C12H22O11(s) Ϫ5645 Table 17.2 lists heats of combustion for some common substances. The heat of combustion is the heat of reaction for the complete burning of one mole of a substance. The combustion of natural
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The pH of various mixtures and find the dissociation constant of acetic acid Chemistry (HL) Research Question: To determine the pH of various mixtures of sodium acetate and acetic acid in an aqueous solution and hence to find the dissociation constant of the acetic acid. Background: The mixture of sodium acetate and acetic acid in aqueous solution is a buffer solution. Buffer solutions are the solutions which resist a sudden change in the pH due to addition of small amounts of strong acid or base
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(The molar heat capacity of liquid water is 75.4 J/mol ºC; the molar heat capacity of ice is 40.2 J/mol ºC. The molar heat of vaporization of water is 40.7 kJ/mol. The molar heat of fusion of water is 6.02 kJ/mol.) (A) 71.8 kJ (B) 419 kJ (C) 64.2 kJ (D) 64.6 kJ (E) 11‚620 J 2. Which physical property of a liquid is NOT the result of strong intermolecular forces? (A) high vapor pressure (B) high boiling point (C) high heat of fusion (D) high melting point (E) high heat of vaporization
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Get free access to PDF Ebook Lab 19 Heat Of Combustion Answer Key at our Ebook Library LAB 19 HEAT OF COMBUSTION ANSWER KEY PDF The regular type of help documentation is really a hard copy manual that’s printed‚ nicely bound‚ and functional. Itoperates as a reference manual - skim the TOC or index‚ get the page‚ and stick to the directions detail by detail.The challenge using these sorts of documents is the fact that user manuals can often become jumbled and hard tounderstand. And in order to fix
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EXPERIMENT AIM: To determine the experimental heat of combustion of methanol (CH3OH) and ethanol (CH3CH2OH). To decide which would be a better choice to take on a camping trip. MATERIALS: 1 Copper container 1 Clamp 1 Spirit Lamp with Wick Ethanol 1 Retort Stand Methanol 1 Box of Matches Water 1 Electronic Balance Thermometer PROCEDURE: Firstly‚ Measure the weight of the empty Copper container on the electronic balance. Record your results in a table. Secondly‚ fill the copper container with
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Heats of Combustion of Alkanols Aim: To perform a first-hand investigation to determine the heats of combustion of selected alkanols. Hypothesis: It was predicted that methanol would have the highest molar heat of combustion‚ decreasing as the chains become longer. Equipment: • Three spirit burners containing methanol‚ ethanol and propan-1-ol respectively • Electronic scales • Water • 100ml measuring cylinder • Retort stand and boss-head clamp • Copper beaker • Thermometer Method:
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BACHELOR OF SCIENCE IN CIVIL ENGINEERING UNIVERSITY OF SAN CARLOS-TALAMBAN CAMPUS CEBU CITY‚ PHILIPPINES (Effective June 2008) FIRST YEAR/FIRST SEMESTER Lec Lab Course Title Hrs Hrs Algebra 3 0 Trigonometry 3 0 Solid Mensuration 2 0 Engineering Graphics 1 0 3 Communication Arts 1 3 0 Sining ng Pakikipagtalastasan 3 0 Man in Search of God 3 0 Self Testing Activities 2 0 Civic Welfare Training Services 1 3 0 Total 22 3 FIRST YEAR/SECOND SEMESTER Lec Lab Hrs Hrs Course Title Analytic & Solid Geometry
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Aim To find out difference in the heat of combustion for different types of alcohols. Hypothesis The higher the number of carbon atoms in an alcohol is‚ the higher the energy for the heat of combustion. Alcohol is a homologous series‚ a series of organic compounds with similar formula and chemical properties‚ and increase in molecular size and mass. When the equations for combustion of these alcohols are listed in the order of increasing number of carbon atoms‚ Methanol 1 CH3OH(l) + 3/2 O2(g)
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