Question

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 a hydrogen molecule.(b) same as that of a hydrogen molecule.(c) four times that of a hydrogen molecule.(d) half that of a hydrogen molecule.

Answer 1

Kinetic energy of gas molecule depends on temperature and does not depend upon the nature of gas.

K.E =(3/2)kT.

Thus hydrogen and helium have same K.E at same temperature

HOPE IT HELPS

Answer 2

Kinetic energy is directly proportional to temperature

but it is independent of mass of atom

so, the average kinetic energy of helium is same to that is hydrogen