40.A rigid container holds a mixture of two non-reacting ideal gases: 1.0 mole of He and 2.0 moles of N2. The temperature of the mixture is maintained at 27 °C. Let R denote the universal gas constant. What is the constant-volume molar specific heat Cv of the gas mixture? (Assume all degrees of freedom appropriate at room temperature are active.)
(A) 3R/2
(B) 13R/6
(C) 5R/2
(D) 3R
(E) 7R/2

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統計： A(0), B(2), C(0), D(1), E(0) #3847816