Helium atom is two times heavier than a hydrogen molecule (H2). At 298K, the average kinetic energy of helium atom is
A
Two times that of a hydrogen molecule
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B
Half that of a hydrogen molecule
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C
Four times that of a hydrogen molecule
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D
Same as that of a hydrogen molecule
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Solution
The correct option is D Same as that of a hydrogen molecule Average kinetic energy for a helium atom is 3RT2NA
It is independent of molar mass.
Hence (¯KE)H2=(¯KE)He