Ethalpies of solution of `BaCI_(2)(s)` and `BaCI_(2).2H_(2)O(s)` are `-20.0kJ mol^(-1)` and `8.0 kJ mol^(-1)`, respectively. Calculate `Delta_(hyd)H^(Theta)` of `BaCI_(2)` to `BaCI_(2).2H_(2)O`.

Explanation

To calculate the enthalpy change (Δ_hydH^Θ) for the reaction of converting solid BaCl₂ to solid BaCl₂·2H₂O, we can follow these steps:

### Step 1: Write the Reaction
The reaction can be represented as:
\[ \text{BaCl}_2 (s) + 2 \text{H}_2\text{O} (l) \rightarrow \text{BaCl}_2 \cdot 2\text{H}_2\text{O} (s) \]

### Step 2: Identify Given Enthalpies
From the problem, we have the following enthalpies of solution:
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