Enthalpies of solution of and are –20.6 kJ/mol and 8.8 kJ/mol, respectively. hydration of to is — Thermodynamics and Thermochemistry Chemistry Question

Question

Enthalpies of solution of $\text{BaCl}_2\text{(s)}$ and $\text{BaCl}_2\cdot 2\text{H}_2\text{O(s)}$ are –20.6 kJ/mol and 8.8 kJ/mol, respectively. $\Delta H$ hydration of $\text{BaCl}_2\text{(s)}$ to $\text{BaCl}_2\cdot 2\text{H}_2\text{O(s)}$ is