a. Use the data collected by experiment to calculate a molar enthalpy of reaction formethanol.1Answer:[-598 kJ/mol ] 9080LAB EXERCISE 11.DTesting A, Hᵒ from Formation DataThe molar enthalpies of formation method was created earlier inthis section from Hess' law. Both problem-solving methods areconsistent with the law of conservation of energy. This labexercise tests this new method against evidence gathered fromcalorimetry.PurposeThe purpose of this problem is to test the use of molar enthalpiesof formation as a method of predicting the enthalpy change of areaction.ProblemWhat is the standard molar enthalpy of combustion of methanol?Report ChecklistO PurposeO ProblemO Hypothesis● PredictionO DesignO MaterialsO ProcedureO Evidence● AnalysisEvaluation (2, 3)DesignMethanol is burned in excess oxygen in a special calorimeter.Assume that liquid water is produced.Evidencemass of methanol reacted = 4.38 gmass of water equivalent to calorimeter = 2.60 kginitial temperature of calorimeter = 20.4 °Cfinal temperature of calorimeter = 27.9 °C(Note that the calorimeter has the same thermal energy gain orloss as the water equivalent stated.)

mass of methanol = 4.38 g mass of water = 2.60 kg = 2600 g (1 kg = 1000 g ) Initial temperature=…

Evidence mass of methanol reacted = 4.38 g mass of water equivalent to calorimeter = 2.60 kg initial temperature of calorimeter = 20.4 °C final temperature of calorimeter = 27.9 °C (Note that the calorimeter has the same thermal energy gain or

Evidence mass of methanol reacted = 4.38 g mass of water equivalent to calorimeter = 2.60 kg initial temperature of calorimeter = 20.4 °C final temperature of calorimeter = 27.9 °C (Note that the calorimeter has the same thermal energy gain or

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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3. During the experiment, when calculating AH using the formula AH=C x AT, can we calculate the AH without measuring the amount of water that we put inside the calorimeter? Explain why or why not. (max of 5 sentences) 4. You accidentally forgot to measure the mass of the octane that you transferred in the crucible. You already started the calorimeter and it is too late to stop the equipment. Is it still possible to calculate the energy (in Joules) of octane? Explain.(max of 2 sentences)
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