The bond dissociation enthalpies of H2(g),Cl2(g) and HCl(g) are 435, 243 and 431 kJ mol−1 respectively. The enthalpy of formation of HCl(g) will be
The bond dissociation enthalpies of and are and respectively. The enthalpy of formation of will be
The bond dissociation enthalpies of and are and respectively. The enthalpy of formation of will be