A box contains a mixture of `H_(2)` and He gases. Which of the following statements are correct?

Options

A. The average translational kinetic energies of `H_(2)` molecules and He atoms are same
B. The average energies of `H_(2)` molecules and He atoms are same
C. `H_(2)` molecules have greater average energy than that of He atoms
D. The average speed of `H_(2)` molecules and He atoms are same

Answer

A, C

Explanation

Average translational energy of any ideal gas is
`E_("translational")=(3)/(2)RT`
while total energy of diatomic molecule will be greater than that of monatonic.
`E_("diatomic")=(5R)/(2),E_("monoatomic")=(3)/(2)RT`
The average energy of `H_(2)` molecule is greater than that of He.