Hydration energies of  $L{i}^{+}$ and $C{l}^{-}$are - 499 and - 382 k.J $mol{e}^{-1}$ .If lattice energy of LiCl is +840 k.J$mol{e}^{-1}$ , heat of solution of $\mathrm{LiCl}$  is