For the reaction H₂ + Cl₂ → 2HCl, the bond enthalpies given are H–H = 285 kJ mol⁻¹, Cl–Cl = 436 kJ mol⁻¹ and H–Cl = 425 kJ mol⁻¹. Calculate the enthalpy change of the reaction.
University of Ilorin CHM101 2026-exam past question
- −129 kJ
- +129 kJ
- −169 kJ
- +169 kJ
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