A-LevelChemistryChemical energetics9701/12 · May/June 2024 · Q101 Mark

Which equation has an enthalpy change equal to the standard enthalpy of formation of sodium oxide?

ANa(s) + ½O2(g) → ½Na2O(s)

BNa(s) + O2(g) → Na2O(s)

C2Na(s) + ½O2(g) → Na2O(s)

D4Na(s) + O2(g) → 2Na2O(s)

✓ Correct answer

C: 2Na(s) + ½O2(g) → Na2O(s)

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2024 Paper 1 Variant 2, question 10.

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