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A polyatomic molecule has 3 translational, 3 rotational and f vibrational modes. Molar Cv?
A(3 + f) R
B(4 + f) R
C(3 + 2f) R
D(3/2 + f) R
Answer & Solution
Correct answer: A. (3 + f) R
Six modes give 3 kB T and f vibrations give f kB T per molecule, so Cv = (3 + f) R per mole.
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