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A diatomic gas also has one active vibrational mode. What is its molar Cv?
A(5/2) R
B3 R
C(9/2) R
D(7/2) R
Answer & Solution
Correct answer: D. (7/2) R
The vibration adds kB T per molecule on top of (5/2) kB T, so U = (7/2) RT per mole and Cv = (7/2) R.
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