Question

What is vapour density of \(\text{O}_2\) gas?

• A. 8
• B. 16
• C. 32
• D. 22.4

Hint:

Always remember: \[ \text{Vapour Density}=\frac{\text{Molar Mass}}{2} \] So first find molar mass, then divide by \(2\).

Answer 1

The Correct Option is B

Concept:
Vapour density is defined as: \[ \text{Vapour Density}=\frac{\text{Molar Mass}}{2} \] So, to find vapour density, we first find the molar mass of the gas.

Step 1: Find the molar mass of \(\text{O}_2\).
Atomic mass of oxygen is \(16\). So, \[ \text{Molar mass of } \text{O}_2 = 2 \times 16 = 32 \]

Step 2: Apply the formula of vapour density.
\[ \text{Vapour Density}=\frac{32}{2}=16 \] Hence, the correct answer is:
\[ \boxed{(B)\ 16} \]