Question

Hydrogen diffuses six times faster than a gas $X$. The molecular weight of $X$ is:

• A. 36
• B. 72
• C. 28
• D. 48

Answer 1

The correct option is B 72

According to Graham's law of diffusion,

rate of diffusion $\propto \frac{1}{Molarmass}$

Hydrogen diffuses six times faster than X.

So, $\frac{6}{1}=\sqrt{\frac{MolarmassX}{2}}⟹36\times 2=MolarmassX$

Molar mass of $X=72$