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Internal energy of n moles of ideal gas (monatomic):

AU = (3/2) nRT
BU = (5/2) nRT
CU = nR
DU = nRT
Answer & Solution
Correct answer: A. U = (3/2) nRT
**Monatomic:** U = (3/2) nRT. **Diatomic at moderate T:** U = (5/2) nRT. **Triatomic linear:** (5/2)nRT (5 DOF) bent: (3)nRT (6 DOF approximately).
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