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A helium atom is two times heavier than ...

A helium atom is two times heavier than a hydrogen molecule. At `298 K`, the average kinetic energy of a helium atom is

A

the same as that of a hydrogen molecule

B

four times that of a hydrogen molecule

C

half that of a hydrogen molecule

D

two time that of a hydrogen molecule

Text Solution

Verified by Experts

The correct Answer is:
A
According to that kinetic molecular theory of gases , we have
Kinetic energy (KE) per mole = `(3)/(2) RT`
i.e., `KE prop T`
Thus , at the same temperature , both `He` and `H_(2)` possess the same `KE`.
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