The densities of two gases are in the ratio of $1 : 16$. The ratio of their rates of diffusion is

$A$ vessel contains equal masses of hydrogen,helium,and methane. The total pressure of the mixture is $1300 \ torr$. What is the partial pressure of hydrogen gas in $torr$?

$A$ closed vessel contains an equal number of nitrogen and oxygen molecules at a pressure of $P \ mm$. If nitrogen is removed from the system,then the pressure will be

The interaction energy of $London$ forces between two particles is proportional to $r^{x}$,where $r$ is the distance between the particles. The value of $x$ is:

It takes $38 \, s$ for $1 \, mol$ of $N_2$ gas to effuse through a pinhole at a pressure of $0.8 \, atm$. It takes $57 \, s$ for $1 \, mol$ of an unknown gas $X$ to effuse through the same pinhole at a pressure of $1.6 \, atm$. Calculate the molar mass of $X$.

When a gas is heated at constant pressure from $20\,^oC$ to $40\,^oC$,its volume: