The molecular formula of Glauber's salt is

Options

A. `MgSO_(4).7H_(2)O`
B. `CuSO_(4).5H_(2)O`
C. `FeSO_(4).7H_(2)O`
D. `Na_(2)SO_(4).10H_(2)O`

Explanation

To determine the molecular formula of Glauber's salt, we can follow these steps:

### Step 1: Identify the components of Glauber's salt
Glauber's salt is known to be a hydrated form of sodium sulfate. The chemical formula for sodium sulfate is Na2SO4.

### Step 2: Determine the number of water molecules
Glauber's salt specifically refers to sodium sulfate decahydrate, which means it contains 10 water molecules associated with each formula unit of sodium sulfate.

### Step 3: Write the complete molecular formula
To write the complete molecular formula, we combine the sodium sulfate formula with the water molecules:
- Sodium sulfate: Na2SO4
- Water: 10 H2O

Thus, the complete molecular formula for Glauber's salt is:
\[ \text{Na}_2\text{SO}_4 \cdot 10 \text{H}_2\text{O} \]

### Step 4: Conclusion
The molecular formula of Glauber's salt is Na2SO4·10H2O.

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