A-LevelChemistryChemical energeticsMay/June 2014Paper 1 Q31 Mark
The enthalpy change of formation of carbon dioxide is –394 kJ mol⁻¹. The enthalpy change of formation of water is –286 kJ mol⁻¹. The enthalpy change of formation of methane is –74 kJ mol⁻¹. What is the enthalpy change of combustion of methane?
A-892 kJ mol⁻¹
B-606 kJ mol⁻¹
C+606 kJ mol⁻¹
D+892 kJ mol⁻¹
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The correct answer is A. This question tests the candidate's understanding of chemical energetics within the Chemistrysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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