Question

The volume at $STP$ of $5.6$ grams of a gas whose vapour density is $5.6$ is:

• A. $5.6$ $L$
• B. $11.2$ $L$
• C. $22.4$ $L$
• D. $44.8$ $L$

Answer 1

Answer: (B)

$11.2$ $L$

Mol. wt. $=2\times V.D.=11.2$

No. of moles of gas $=\frac{5.6}{11.2}=1:2=0.5moles$

$1$ mole of gas occupies $22.4$ litres at $STP$

$0.5$ moles of it will occupy $11.2$ litres at $STP$

Hence, option $B$ is correct.