What is the total kinetic energy of $0.6 \ mol$ of an ideal gas at a temperature of $27 \ ^oC$ in $J$?

According to the kinetic theory of gases,which of the following statements are correct?
$A$. Collisions are always elastic.
$B$. Heavier molecules transfer more momentum to the wall of the container.
$C$. Only a small number of molecules have very high velocity.
$D$. Between collisions,the molecules move in straight lines with constant velocities.

For a gas,the ratio $C_p/C_v$ is $1.3$ and its atomic mass is $M$. What is the molecular mass of the gas?

Which of the following gases has the largest mean free path?

If a gas expands at a constant temperature,then...

Which of the following relations is correct for an ideal gas?