A-LevelChemistryChemical energeticsOct/Nov 2014Paper 1 Q31 Mark
Ethanol is increasingly being used as a fuel for cars. The standard enthalpy change of formation of carbon dioxide is –393 kJ mol⁻¹. The standard enthalpy change of formation of water is –286 kJ mol⁻¹. The standard enthalpy change of formation of ethanol is –277 kJ mol⁻¹. What is the standard enthalpy change of combustion of ethanol?
A-1921 kJ mol⁻¹
B-1367 kJ mol⁻¹
C-956 kJ mol⁻¹
D-402 kJ mol⁻¹
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The correct answer is B. 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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