Question

The rate of diffusion of methane at a given temperature is thrice that of a gas $x$. The molar mass $\left(ingmo{l}^{-1}\right)$ of $x$ is:

• A. 64
• B. 32
• C. 144
• D. None of the above

Answer 1

The correct option is C 144

$\frac{R_{C{H}_4}}{R_{gas}}=\sqrt{\frac{M_{gas}}{M_{C{H}_4}}}$
$3=\sqrt{\frac{M}{16}}\Rightarrow M=144gmo{l}^{-1}$