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The specific heats, C P and C V of a gas of diatomic milecules, A, are given (in units of J mol –1 K –1 ) by 29 and 22, respectively. Another gas of diatomic moleucles, B, has the corresponding values 30 and 21. If they are treated as ideal gases, then :

1. Both A and B have a vibrational mode each
2. A is rigid but B has a vibrational mode.
3. A has a vibrational mode but B has none.
4. A has one vibrational mode and B has two.

Correct answer: A has a vibrational mode but B has none.

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