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`

Answer

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

### Step 1: Identify Glauber's Salt
Glauber's salt is commonly known as sodium sulfate decahydrate.

### Step 2: Write the Chemical Composition
The chemical composition of Glauber's salt consists of sodium sulfate (Na2SO4) and water (H2O).

### Step 3: Count the Water Molecules
Glauber's salt specifically contains 10 water molecules associated with each formula unit of sodium sulfate.

### Step 4: Combine the Components
To write the molecular formula, we combine the sodium sulfate and the water:
- Sodium sulfate: Na2SO4
- Water: 10 H2O

### Step 5: Write the Final Molecular Formula
The final molecular formula of Glauber's salt is:
\[ \text{Na}_2\text{SO}_4 \cdot 10\text{H}_2\text{O} \]

### Conclusion
Thus, the molecular formula of Glauber's salt is \( \text{Na}_2\text{SO}_4 \cdot 10\text{H}_2\text{O} \).

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