Is formation of ozone from oxygen an endothermic or exothermic reaction?

Explanation

To determine whether the formation of ozone (O₃) from oxygen (O₂) is an endothermic or exothermic reaction, we can follow these steps:

### Step 1: Understand the Reaction
The reaction in question is:
\[ 3O_2 \rightarrow 2O_3 \]
This indicates that three molecules of oxygen gas (O₂) are converted into two molecules of ozone (O₃).

### Step 2: Analyze Stability
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