Chemistry - Thermochemistry Question with Solution | TestHub

The enthalpy of solution of ${\mathrm{BaCl}}_2(\mathrm{s})$ and ${\mathrm{BaCl}}_2\cdot 2{\mathrm{H}}_2\mathrm{O}(\mathrm{s})$ are -20.6 and $8.8\mathrm{kJ}{\mathrm{mol}}^{-1}$ respectively. Calculate magnitude of enthalpy of hydration (in kJ ) for the given reaction :

${\mathrm{BaCl}}_2(s)+2{\mathrm{H}}_2\mathrm{O}\to {\mathrm{BaCl}}_2\cdot 2{\mathrm{H}}_2\mathrm{O}(\mathrm{s})$