The percentage water loss when gypsum is heated to get plaster of Paris is___

Explanation

To find the percentage of water loss when gypsum is heated to obtain plaster of Paris, we can follow these steps:

### Step 1: Identify the chemical formula of gypsum
Gypsum is chemically represented as calcium sulfate dihydrate, which has the formula:
\[ \text{CaSO}_4 \cdot 2\text{H}_2\text{O} \]

### Step 2: Determine the amount of water in gypsum
From the formula, we can see that gypsum contains 2 moles of water (2H₂O).
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