When ammonium acetate is heated_____is formed.

Explanation

**Step-by-Step Solution:**

1. **Identify the Reactant**: The reactant in this case is ammonium acetate, which has the chemical formula CH3COONH4.

2. **Understand the Heating Process**: When ammonium acetate is heated, it undergoes a thermal decomposition reaction. This means that the compound breaks down into simpler substances when exposed to heat.

3. **Release of Water**: During the heating process, a water molecule (H2O) is released. This occurs because the ammonium ion (NH4+) and the acetate ion (CH3COO-) react to form a new compound while eliminating water.

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