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  4. The vapour density of gas A is four times that of B. If molecular mass of B is M, then molecular mass of A is:

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Q. The vapour density of gas $A$ is four times that of $B$. If molecular mass of $B$ is $M$, then molecular mass of $A$ is:

Some Basic Concepts of Chemistry

Solution:

Molecular mass of $B=M$

V.D. of $B=M / 2$

V.D. of $A =4 \times$ V.D. of $B$

$4 \times \frac{ M }{2}=2 M$

Molecular mass of $A =2 \times 2 M =4 M$