What is the kinetic energy of $1$ mole of a monoatomic gas at $0 \, ^\circ C$? $(R = 8.31 \, J/mol \cdot K)$

The kinetic energy of $1$ mole of $He$ gas at $27^{\circ}C$ is .... $J$.

Vessel $A$ is filled with hydrogen while vessel $B,$ whose volume is twice that of $A,$ is filled with the same mass of oxygen at the same temperature. The ratio of the mean kinetic energies of hydrogen and oxygen is

The kinetic energy,due to translational motion,of most of the molecules of an ideal gas at absolute temperature $T$ is proportional to:

For a gas at a particular temperature on an average,the quantity which remains same for all molecules is

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