dRri pe P △，Gm=△，GR+RTLn Pr /po Po/P =△，Gg+RTLn O 由(2)(3)反应 △，G9=△，Gn+△G3+△G4 m △，Gm=0平衡 1919 D P P D P P G V dP RTLn D    = = 1  r Gm =  r Gm +RTLn   P P P P D E / / =  r Gm +RTLn  QP 由（2）（3）反应  r Gm = 3 4 ' r Gm + G + G 0 ' r Gm = 平衡