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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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