Kinetic energy of an ideal gas I've heard that the kinetic energy of any different gases are the same


  All gases at a given temperature have the same average kinetic energy.


But if we have 2 moles of hydrogen and 4 moles of helium in a container at a specific temperature will the kinetic energies become the same?
I think it cannot be as the n is different..

As the kinetic energy is 
3nrt/2

This might be a small question but this has been a conflict between my friends..
The answer is in front of you. $E_v$ is the Total translational  kinetic energy not the Average kinetic energy. If you want average translational kinetic energy per mol this is given by: $E_v/n$ or $3/2RT$.