The enthalpy of dissolution of ${\mathrm{BacI}}_2\left(\mathrm{s}\right)$ and ${\mathrm{BaCl}}_2\cdot 2{\mathrm{H}}_2\mathrm{O}\left(s\right)$ are $-20.6$ and $8.8 \mathrm{KJ} {\mathrm{mol}}^{-1}$ respectively. Calculate enthalpy of hydration for given reaction:

${\mathrm{BaCl}}_2\left(s\right)+2{\mathrm{H}}_2\mathrm{O}⟶{\mathrm{BaCl}}_2\cdot 2{\mathrm{H}}_2\mathrm{O}\left(s\right)$