What is the kinetic energy of $1$ mole of a monatomic gas?

$A$ cylinder of capacity $20 \, L$ is filled with $H_2$ gas. The total average translational kinetic energy of the molecules is $1.5 \times 10^5 \, J$. Find the pressure of hydrogen in the cylinder.

If $E$ is the kinetic energy per mole of an ideal gas and $T$ is the absolute temperature,then the universal gas constant is given as

In a vessel,the gas is at pressure $P_0$. If the mass of all the molecules is halved and their speed is doubled,then the resultant pressure will be

The kinetic energy of $1 \ g$ of $He$ gas at $272^{\circ}C$ is ........... $J$.

The pressure exerted by an ideal gas on the walls of a container is