Calculate the percentage of water of crystallisation in the sample of blue vitriol `(CuSO_(4).5H_(2)O)`.

Explanation

To calculate the percentage of water of crystallization in the sample of blue vitriol (CuSO₄·5H₂O), we will follow these steps:

### Step 1: Calculate the molar mass of CuSO₄·5H₂O

1. **Find the molar mass of each component:**
- Copper (Cu): 63.5 g/mol
- Sulfur (S): 32.1 g/mol
- Oxygen (O): 16.0 g/mol (there are 4 oxygen atoms in CuSO₄)
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