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If for a gas, R / Cv = 0.67, the gas is made up of molecules which are

1. diatomic
2. mixture of diatomic and polyatomic molecules
3. monoatomic
4. polyatomic

Correct answer: diatomic

Solution

The ratio R/Cv is equal to (γ - 1), where γ = Cp/Cv. For diatomic gases, γ = 7/5 = 1.4, so R/Cv = 1.4 - 1 = 0.4. This matches the given value, indicating the gas is diatomic.

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