A-LevelChemistryChemical energetics9701/12 · May/June 2016 · Q81 Mark

The equation for the complete combustion of propan-1-ol is shown. CH₃CH₂CH₂OH(l) + 4½ O₂(g) → 3CO₂(g) + 4H₂O(l) Standard enthalpy changes of formation are given. compound ΔH CH₃CH₂CH₂OH(l) -303 kJ mol⁻¹ CO₂(g) -394 kJ mol⁻¹ H₂O(l) -286 kJ mol⁻¹ What is the standard enthalpy change of combustion of propan-1-ol, in kJ mol⁻¹?

A-394 – 286 – 303

B303 – (4 × 286) – (3 × 394)

C394 + 286 – 303

D(3 × 394) + (4 × 286) + 303

✓ Correct answer

B: 303 – (4 × 286) – (3 × 394)

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2016 Paper 1 Variant 2, question 8.

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