Question

A helium atom is two times heavier than a hydrogen molecule. At `298 K`, the average kinetic energy of a helium atom is
A. two times that of hydrogen molecule
B. Same as that of the hydrogen molecule
C. four times that of a hydrogen molecule
D. half that of a hydrogen molecule

Answer 1

Correct Answer - B
Average `KE=(3)/(2) RT and T` is constant at `298 K`
`KE` is same for all gases at same temperature.