State giving reason whether the following reaction would involve an increase, a decrease or no change in entropy.
`4Fe(s) + 3O_2(g) to 2Fe_2O_3 (s)`

Explanation

To determine whether the reaction \( 4Fe(s) + 3O_2(g) \to 2Fe_2O_3(s) \) involves an increase, decrease, or no change in entropy, we can follow these steps:

### Step 1: Identify the states of the reactants and products
- The reactants consist of 4 moles of solid iron (Fe) and 3 moles of gaseous oxygen (O₂).
- The product is 2 moles of solid iron(III) oxide (Fe₂O₃).

### Step 2: Count the number of moles of gaseous reactants and products
- **Gaseous reactants**: There are 3 moles of O₂ (gaseous).
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