At a certain temperature and pressure,helium diffuses $n$ times faster than methane. Find the value of $n$.

When the temperature is raised,the viscosity of a liquid decreases. This is because:

$A$ gas diffuses $1/3$ times as fast as hydrogen. Its molecular weight is

According to Graham's law at a given temperature,the ratio of the rates of diffusion ${r_A}/{r_B}$ of gases $A$ and $B$ is given by

In a mixture of $CO_2$ and $CH_4$ in a closed vessel at a constant temperature,the total pressure is $8.3 \times 10^4 \, Pa$. If the partial pressure of $CO_2$ is $2.8 \times 10^4 \, Pa$,what will be the partial pressure of $CH_4$?

Dalton's law of partial pressure is not applicable for which of the following mixtures?