O-LevelChemistryRates of Reaction5070/12 · Oct/Nov 2023 · Q131 Mark

Hydrogen reacts with chlorine to form hydrogen chloride. H2(g) + Cl2(g) → 2HCl(g) The enthalpy change, ∆H, for this reaction can be calculated using bond energies. What is the value of ∆H for this reaction?

A-247 kJ/mol

B-184 kJ/mol

C+184 kJ/mol

D+247 kJ/mol

✓ Correct answer

B: -184 kJ/mol

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2023 Paper 1 Variant 2, question 13.

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