The heat of solution of anhydrous `CuSO_(4)` is -15.9 kcal and that of `CuSO_(4).5H_(2)O` is 2.8 kcal. The heat of hydration of `CuSO_(4)` will be

Options

A. `+9.35 kcal`
B. `-9.35 kcal`
C. `+18.7 kcal`
D. `-18.7 kcal`

Explanation

To find the heat of hydration of anhydrous CuSO₄, we can use the given heats of solution for both anhydrous CuSO₄ and its hydrated form, CuSO₄·5H₂O.

### Step-by-Step Solution:

1. **Write the Heat of Solution for Anhydrous CuSO₄:**
The heat of solution for anhydrous CuSO₄ when it dissolves in water is given as:
\[
\text{CuSO}_4 (s) \rightarrow \text{CuSO}_4 (aq) \quad \Delta H_1 = -15.9 \text{ kcal}
...