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 hydrated CuSO₄ (CuSO₄·5H₂O). Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Given Data
- The heat of solution of anhydrous CuSO₄ (ΔH₁) = -15.9 kcal
- The heat of solution of hydrated CuSO₄ (CuSO₄·5H₂O) (ΔH₂) = +2.8 kcal

### Step 2: Write the Reactions
1. For anhydrous CuSO₄ dissolving in water:
...