Atomic weight of chlorine is 35.5. What is its vapour density ?

Explanation

To find the vapor density of chlorine given its atomic weight, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Vapor Density**:
The vapor density (Vd) of a substance is defined as the ratio of the molecular mass of the substance to the molecular mass of hydrogen (H2). The formula is:
\[
Vd = \frac{\text{Molecular Mass of the substance}}{\text{Molecular Mass of Hydrogen}}
...