Calculate formula unit mass of `Na_(2)CO_(3).10H_(2)O`

Explanation

To calculate the formula unit mass of \( \text{Na}_2\text{CO}_3 \cdot 10\text{H}_2\text{O} \) (washing soda), we need to follow these steps:

### Step 1: Identify the components of the compound
The compound \( \text{Na}_2\text{CO}_3 \cdot 10\text{H}_2\text{O} \) consists of:
- 2 Sodium (Na) atoms
- 1 Carbon (C) atom
- 3 Oxygen (O) atoms from the carbonate ion (\( \text{CO}_3^{2-} \))
- 10 Water (H₂O) molecules
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