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A sample of helium gas is at a temperatu...

A sample of helium gas is at a temperature of `300 K` and a pressure of `0.5 atm`. What is the average kinetic energy of a molecule of a gas ?

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The correct Answer is:
A, B
Helium gas is monoatomic. So, its degree of freedom `f = 3` . Average kinetic energy of (1) molecule of gas
= `f/2 k T = 3/2 k T`
= `3/2 (1.38 xx 10^-23)(300)`
= `6.21 xx 10^-21 J`.
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