The relative molecular mass of a gas is 44. Therefore, its vapour density is

Options

A. 44
B. 88
C. 22
D. 11

Answer

To find the vapor density of a gas given its relative molecular mass, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Vapor Density**:
Vapor density (VD) is defined as the mass of a certain volume of gas compared to the mass of an equal volume of hydrogen at the same temperature and pressure. The formula for vapor density is:
\[ \text{Vapor Density} = \frac{\text{Molar Mass of the Gas}}{\text{Molar Mass of Hydrogen}} \]

2. **Identify the Molar Mass of Hydrogen**:
The molar mass of hydrogen (H₂) is approximately 2 g/mol. This is because each hydrogen atom has a mass of about 1 g/mol, and there are two hydrogen atoms in a hydrogen molecule.

3. **Given Data**:
The relative molecular mass (molar mass) of the gas is given as 44 g/mol.

4. **Substitute Values into the Formula**:
Using the formula for vapor density:
\[ \text{Vapor Density} = \frac{\text{Molar Mass of the Gas}}{\text{Molar Mass of Hydrogen}} = \frac{44 \, \text{g/mol}}{2 \, \text{g/mol}} \]

5. **Calculate the Vapor Density**:
Now, perform the calculation:
\[ \text{Vapor Density} = \frac{44}{2} = 22 \]

6. **Final Answer**:
Therefore, the vapor density of the gas is 22.