Question

Given that bond energies of H – H and Cl – Cl are 430 kJ mol⁻¹ and 240 kJ mol⁻¹ respectively and $\Delta_fH$ for HCl is – 90 kJ mol⁻¹, bond enthalpy of HCl is
(a) 380 kJ mol⁻¹
(b) 425 kJ mol⁻¹
(c) 245 kJ mol⁻¹
(d) 290 kJ mol⁻¹

Answer 1

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Given that bond energies of H – H and Cl – Cl are 430 kJ mol⁻¹ and 240 kJ mol⁻¹ respectively and $\Delta_fH$ for HCl is – 90 kJ mol⁻¹, bond enthalpy of HCl is (c) 245 kJ mol⁻¹ .