Gas $X$ diffuses three times faster than gas $Y$. What is the ratio of their densities,i.e.,$D_x : D_y$?

The ratio of the rate of diffusion of $SO_2$ and $O_2$ is .......

Write the order of kinetic energy for solid,liquid,and gas.

What is the difference between $STP$ (or $NTP$) and $SATP$?

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?

Hydrogen gas diffuses $4$ times faster than a mixture of $C_2H_4$ and $CO_2$. Find the molar ratio of $C_2H_4$ and $CO_2$ in the mixture.