5.理想氣體密封於圖(三)左側之空間內，壓力與體積分別為P1與V1，外壓力為Pext，\(P_1 > P_{ext}\)。若將活塞栓C移去，下列敘述何者錯誤？ (A)恆溫程序時，q=–W(B)\(P_{ext} = 0\)時，系統所吸收之熱量完全轉變為內能之增加(C)孤立系統之自由膨脹，系統內能變化為零(D)絕熱下之自由膨脹，溫度下降

12.a下列反應式均列有該反應之\(\Delta H_{298}^0(J)\)及\(\Delta S_{298}^0 (\text{J K}^{-1})\)值，試問何種反應在任何溫度下都不可能進行自發反應？(A)\(\text{H}_2(\text{g})+\text{Cl}_2(\text{g}) \rightarrow 2\text{HCl}[\Delta H_{298}^0 = -185, \Delta S_{298}^0 = 141]\)(B)\( \text{NH}_4\text{Cl(s)} \rightarrow \text{NH}_3\text{(g)} + \text{HCl(g)} [\Delta H_{298}^0 = 176, \Delta S_{298}^0 = 284] \)(C)\(2\text{SO}_2(\text{g}) + \text{O}_2(\text{g}) \rightarrow 2\text{SO}_3(\text{g}) [\Delta H_{298}^0 = -198, \Delta S_{298}^0 = 187]\)(D)\(3\text{O}_2(\text{g}) \rightarrow 2\text{O}_3(\text{g}) [\Delta H_{298}^0 = 286, \Delta S_{298}^0 = -137]\)

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