Given that bond energies of H - H and Cl - Cl are 430 ${\text{KJ mol}}^{-}$ and $240 \mathrm{KJ} {\mathrm{mol}}^{-}$ respectively and ${\mathrm{\Delta }}_{\mathrm{f}}\mathrm{H}$ for HCI is $-90\mathrm{kJ}{\mathrm{mol}}^{-1}$. Bond enthalpy of HCI is