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For monatomic ideal gas, U/T (heat capacity at const V) per mole:

AR
B(5/2)R
C(3/2)R
D2R
Answer & Solution
Correct answer: C. (3/2)R
C_v = dU/dT = (3/2)R for monatomic. (For diatomic: (5/2)R, for triatomic linear: (5/2)R, non-linear: 3R.) Used in computing heat added to gas processes.
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