MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryGaseous stateKinetic theory of gases

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✓ Correct

C.four times that of a hydrogen molecule

D.half that of a hydrogen molecule

Explanation

We know that, kinetic energy= 3RT/2 Kinetic energy doesn’t depend upon the mass of gas. Therefore, for both gases it must be similar at same temperatures. Maxwell's distribution of molecular speeds

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