The vapour density of carbon dioxide is 22. What is its gram molecular mass?

Explanation

To find the gram molecular mass of carbon dioxide (CO₂) given its vapor density, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Vapor Density**:
- Vapor density (Vd) is defined as the density of a gas relative to the density of hydrogen. It can be expressed as:
\[
\text{Vapor Density} = \frac{\text{Molecular Mass of the Gas}}{\text{Molecular Mass of Hydrogen}}
...