What is the $SI$ unit of rate of diffusion for a gas?

At $STP$,it takes $1200 \ s$ for $0.48 \ g$ of $O_2$ to effuse through a pinhole. How many $mL$ of $CO_2$ gas will effuse under the same conditions and in the same time?

Provide a detailed explanation of surface tension and viscosity.

If two molecules of $A$ and $B$ have molar masses of $100 \ g/mol$ and $64 \ g/mol$ respectively,and the rate of diffusion of $A$ is $12 \times 10^{-3} \ mol/s$,then the rate of diffusion of $B$ will be:

Name two phenomena that can be explained on the basis of surface tension.

The ratio of rates of diffusion of oxygen and an unknown gas is $1:4$. The unknown gas is