The viscosity of the solvent depends on

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

The ratio of the rate of diffusion of a given element to that of helium is $1.4$. The molecular weight of the element is

If the rate of diffusion of $A$ is $5$ times the rate of diffusion of $B$,what will be the ratio of the densities of $A$ and $B$?

$1 \ L$ each of gases $A$ and $B$ diffused through a membrane in $15$ and $30$ minutes, respectively, under identical conditions. What is the ratio of molecular weight of $A$ and $B$?

At constant pressure,the root mean square velocity of an ideal gas is proportional to the density $(d)$ as: