The molecular formula of oxygen at ordinary temperature is .......... And that of sulfur is ...........

Explanation

To answer the question regarding the molecular formulas of oxygen and sulfur at ordinary temperature, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Identify the Molecular Formula of Oxygen:**
- At ordinary temperature, oxygen exists primarily as a diatomic molecule, which means it consists of two oxygen atoms bonded together.
- The molecular formula for this diatomic form of oxygen is **O₂**.

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