A-LevelChemistryChemical energetics9701/12 · Oct/Nov 2014 · Q111 Mark

For which equation is the enthalpy change correctly described as an enthalpy change of formation?

AC(g) + O₂(g) → CO₂(g)

BC(s) + ½ O₂(g) → CO(g)

C2N(g) + 4O(g) → N₂O₄(g)

D2NO(g) + O₂(g) → 2NO₂(g)

✓ Correct answer

B: C(s) + ½ O₂(g) → CO(g)

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2014 Paper 1 Variant 2, question 11.

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