Chapter 8, Problem 8.64E

Calculate the molar enthalpy of formation of ${\text{I}}^{-}\left(\text{aq}\right)$ if that of ${\text{H}}_{\text{2}}\left(\text{g}\right)+{\text{I}}_{\text{2}}\left(\text{s}\right)\to {\text{2H}}^{+}\left(\text{aq}\right)+{\text{2I}}^{-}\left(\text{aq}\right)$ is $-110.3\text{8 kJ}$.