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R/Cv =0.67 for a gas. Then this gas is made up of which molecules?

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R/Cv =0.67 for a gas. Then this gas is made up of which molecules?

(a) Diatomic

(b) Mixture of diatomic and polyatomic

(c) Monoatomic

(d) Polyatomic

The question was posed to me in an online quiz.

My question is based upon Ideal Gases in section Kinetic Theory of Gases of Engineering Physics I

1 Answer

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Right answer is (c) Monoatomic

The best I can explain: Cv=f/2×R=1/0.67×R

Therefore,

f=2/0.67=3

Hence the gas is monoatomic.

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