What happens when gypsum is heated to 390 K ?

Explanation

To answer the question "What happens when gypsum is heated to 390 K?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Chemical Formula of Gypsum**:
- Gypsum is chemically represented as \( \text{CaSO}_4 \cdot 2\text{H}_2\text{O} \). This means it consists of calcium sulfate combined with two molecules of water.

2. **Understand the Heating Process**:
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