A-LevelChemistryChemical energetics9701/12 · Feb/Mar 2025 · Q131 Mark

Carbon monoxide and methanol can react together to form ethanoic acid. CO(g) + CH3OH(l) →ΔH CH3CO2H(l) Standard enthalpy changes of combustion are given in the table. compound standard enthalpy change of combustion, ΔHᶜ CO -283.0 kJ mol⁻¹ CH3OH -726.0 kJ mol⁻¹ CH3CO2H -874.1 kJ mol⁻¹ What is the value for ∆H for the reaction between carbon monoxide and methanol?

A−1883.1 kJ mol⁻¹

B−134.9 kJ mol⁻¹

C+134.9 kJ mol⁻¹

D+1883.1 kJ mol⁻¹

✓ Correct answer

B: −134.9 kJ mol⁻¹

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2025 Paper 1 Variant 2, question 13.

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