A-LevelChemistryChemical energetics9701/12 · Oct/Nov 2024 · Q101 Mark

Two standard enthalpy change of formation values are given. ΔΗ [VCl2] = −452 kJ mol⁻¹ ∆Η [VC13] = −573 kJ mol⁻¹ What is the enthalpy change for the reaction 3VCl2 → 2VCl3 + V?

A-210 kJ mol⁻¹

B-121 kJ mol⁻¹

C+121 kJ mol⁻¹

D+210 kJ mol⁻¹

✓ Correct answer

D: +210 kJ mol⁻¹

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

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