The enthalpies of solution of anhydrous `CuSO_(4)` and hydrated `CuSO_(4). 5H_(2)O` are -66.5 and 11.7 kJ `mol^(-1)` respectively.Calculate the enthalpy of hydration of `CuSO_(4)` to `CuSO_(4).5H_(2)O`.

Explanation

To calculate the enthalpy of hydration of anhydrous CuSO₄ to form hydrated CuSO₄·5H₂O, we can use the given enthalpies of solution for both compounds. The enthalpy of hydration can be derived from the following steps:

### Step-by-Step Solution:

1. **Identify the Given Data**:
- Enthalpy of solution for anhydrous CuSO₄ (ΔH₁) = -66.5 kJ/mol
- Enthalpy of solution for hydrated CuSO₄·5H₂O (ΔH₂) = +11.7 kJ/mol

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