A-LevelChemistryChemical energetics9701/12 · May/June 2018 · Q331 Mark

For which reactions does the value of ∆H represent both a standard enthalpy change of combustion and a standard enthalpy change of formation? 1 C(s) + O2(g) → CO2(g) 2 2C(s) + O2(g) → 2CO(g) 3 CO(g) + ½O2(g) → CO2(g)

A1, 2 and 3 are correct

B1 and 2 only are correct

C2 and 3 only are correct

D1 only is correct

✓ Correct answer

D: 1 only is correct

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2018 Paper 1 Variant 2, question 33.

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