試題詳解

44. An ideal monoatomic gas of one mole is at pressure P, volume V, and temperature T. The gas is heated at constant volume to 2T. Then the gas is allowed to expand at constant temperature to 2V. Finally, the gas cools at constant pressure to T. What is the net entropy change for this ideal gas? (The ideal gas constant is R)
(A) R ln 2
(B) −R ln 2
(C) 0
(D) R ln 4
(E) not calculatable by the above information