Question

Vapour density of gas is $11.2$, volume occupied by $2.4$g of this at STP will be:

• A. $11.2$ L
• B. $2.24$ L
• C. $22.4$ L
• D. $2.4$ L

Answer 1

Answer: (D)

$2.4$ L

$\text{Vapour density}$ = $\frac{molecularmass}{2}$

11.2 = $\frac{molecularmass}{2}$

Molecular Mass = $22.4$ g

Number of moles $=\frac{2.4}{22.4}$

$=\frac{24}{224}$

Now, Volume = 22.4 x number of moles

$\therefore \frac{24}{224}$ = $\frac{volume}{22.4}$

volume $=\frac{22.4\times 24}{224}=2.4L$

Hence, option $D$ is correct.