The specific heats, \( C_{p} \) and \( C_{v} \) of a gas of diatomic molecules, A, are given (in....

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The specific heats, \( C_{p} \) and \( C_{v} \) of a gas of diatomic molecules, A, are given (in units of \( \mathrm{J} \mathrm{mol}^{-1} \mathrm{k}^{-1} \) ) be
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29 and 22, respectively. Another gas of diatomic molecules, \( \mathrm{B} \), has the corresponding values 30 and 21. If they are treated as ideal gases, then:
(1) \( \mathrm{A} \) is rigid but \( \mathrm{B} \) has a vibrational mode.
(2) A has a vibrational mode but \( \mathrm{B} \) has none.
(3) A has one vibrational mode and \( \mathrm{B} \) has two.
(4) Both A and B have a vibrational mode each.


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