Chemistry · Oct / Nov 2023 · Paper 12 · Question 13

Hydrogen reacts with chlorine to form hydrogen chloride. H2(g) + Cl2(g) → 2HCl(g) The enthalpy change, ΔH, for this reaction can be calculated using bond energies. bond | bond energy in kJ/mol H–H | 436 Cl–Cl | 242 H–Cl | 431 What is the value of ΔH for this reaction?

1. A–247 kJ/mol
2. B–184 kJ/mol
3. C+184 kJ/mol
4. D+247 kJ/mol

As printed in the paper