A-LevelChemistryChemical energetics9701/12 · Oct/Nov 2014 · 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
✓ Correct answer
B: -1367 kJ mol⁻¹
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