When 1 mole of anhydrous `CuSO_(4)` is dissolved in excess of water, -66.4 kJ heat is evolved. When one mole of `CuSO_(4).5H_(2)O` is dissolved in water, the heat change is +11.7 kJ. Calculate enthalpy of hydration of `CuSO_(4)` (anhydrous).

Explanation

To calculate the enthalpy of hydration of anhydrous CuSO₄, we can use the information provided about the heat changes when dissolving both anhydrous CuSO₄ and hydrated CuSO₄·5H₂O in water.

### Step-by-step Solution:

1. **Understanding the dissolution of CuSO₄:**
- When 1 mole of anhydrous CuSO₄ is dissolved in water, the heat evolved is -66.4 kJ. This indicates that the process is exothermic.
- When 1 mole of CuSO₄·5H₂O is dissolved, the heat change is +11.7 kJ, indicating that this process is endothermic.

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