A-LevelChemistryChemical energetics9701/12 · Feb/Mar 2021 · Q71 Mark

An experiment was performed to determine the enthalpy of combustion of ethanol. [Figure showing experimental setup for calorimetry] The data collected are shown. mass of water = Wg mass of ethanol burned = Xg temperature rise = Y°C molar mass of ethanol = Zgmol⁻¹ specific heat capacity of water = 4.2JK⁻¹g⁻¹ Which expression can be used to calculate the enthalpy of combustion of ethanol in kJ mol⁻¹?

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A-4.2WYZ / 1000X

B-4.2WYX / 1000Z

C-4.2XYZ / 1000W

D-4.2X(Y+273)Z / 1000W

✓ Correct answer

A: -4.2WYZ / 1000X

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2021 Paper 1 Variant 2, question 7.

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