The bond dissociation enthalpies of the H–H bond and the H–Cl bond are 435 kJ mol–1 and 431 kJ mol–1 , respectively. The ∆Hºf of HCl( g. is –92 kJ mol–1 . What is the bond dissociation enthalpy of the Cl–Cl bond?

(1) Answers

First, we write the reaction equation for the formation of HCl from hydrogen and chlorine: H₂ + Cl₂ → 2HCl Now, we substitute the values of the enthalpies, denoting that of the Cl-Cl bond by x: 435 + x = -92 + 2(431) x = 335 The bond dissociation enthalpy for the Cl-Cl bond is 335 kJ/mol

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