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(B) The average kinetic energy of an ideal gas molecule is given by the formula $KE = \frac{3}{2}kT$,where $k$ is the Boltzmann constant and $T$ is th

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Equal to that of hydrogen

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(B) The average kinetic energy of an ideal gas molecule is given by the formula $KE = \frac{3}{2}kT$,where $k$ is the Boltzmann constant and $T$ is the absolute temperature.Since the temperature $T$ is the same for both $He$ atoms and hydrogen molecules $(25\,^oC)$,the average kinetic energy depends only on the temperature.Therefore,the kinetic energy of a $He$ atom is equal to the kinetic energy of a hydrogen molecule at the same temperature.

$A$ $He$ atom is twice as heavy as a hydrogen molecule. At $25\,^oC$,the kinetic energy of a $He$ atom is:

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