A vessel contains a mixture of one mole of oxygen and two moles of nitrogen at 300K. The ratio of the average rorational kinetic energy per `O_2` molecules to that per `N_2` molecules is

Explanation

`because E_(av)=(3)/(2)k_(B)T`
It is obvious that the average kinetic energy per molecules of a gas does not depend on mass of molecules and depends upon temperature alone.
Hence, the required ratio is `1:1`.