Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below.

$\frac{1}{2}{\mathrm{Cl}}_2\left(\mathrm{g}\right)\stackrel{(1/2){\mathrm{\Delta }}_{\mathrm{diss}}{H}^{\circ }}{⟶}\mathrm{Cl}\left(\mathrm{g}\right)\stackrel{{\mathrm{\Delta }}_{\mathrm{cg}}{H}^{\circ }}{⟶}{\mathrm{Cl}}^{-}\left(\mathrm{g}\right)\stackrel{{\mathrm{\Delta }}_{\mathrm{hyd}}{H}^{\circ }}{⟶}{\mathrm{Cl}}^{-}\left(\mathrm{aq}\right)$

The energy involved in the conversion of $(1/2){\mathrm{Cl}}_2\left(\mathrm{g}\right)$ to ${\mathrm{Cl}}^{-}\left(\mathrm{aq}\right)$ will be

Given:  ${\mathrm{\Delta }}_{\text{diss }}{H}^{\circ }\left({\mathrm{Cl}}_2\right)=240\mathrm{kJ}{\mathrm{mol}}^{-1};{\mathrm{\Delta }}_{\mathrm{cg}}{H}^{\circ }\left(\mathrm{Cl}\right)=-349\mathrm{kJ}{\mathrm{mol}}^{-1};\text{ and }{\mathrm{\Delta }}_{\mathrm{hyd}}{H}^{\circ }\left({\mathrm{Cl}}^{-}\right)=-381\mathrm{kJ}{\mathrm{mol}}^{-1}$