Define corrosion. What is the chemical formula of rust?

Explanation

### Step-by-Step Text Solution

**Step 1: Define Corrosion**
Corrosion is a chemical process that involves the deterioration of metals due to their reaction with environmental factors. It typically occurs when metals are exposed to moisture, oxygen, and other atmospheric conditions, leading to the formation of undesirable compounds, primarily oxides.

**Step 2: Identify the Chemical Formula of Rust**
Rust is commonly known as hydrated ferric oxide. The chemical formula for rust is represented as Fe₂O₃·XH₂O, where Fe₂O₃ is iron(III) oxide and XH₂O indicates the presence of water molecules that are associated with the iron oxide, making it a hydrated compound.

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