Gas X is the heaviest component of natural air.
Identify X

Explanation

To identify the heaviest component of natural air, we need to analyze the different gases that make up air and compare their atomic masses. Here’s a step-by-step solution:

### Step 1: Identify the components of natural air
Natural air is primarily composed of three gases:
- Nitrogen (N2)
- Oxygen (O2)
- Carbon Dioxide (CO2)

...