C02(g)+2NH(g) 298K.AG>HO(I)+CO(NH2)2() Peos =Po PN po XH2o =1 mCo(NH)h =m △，G9=-RTLnK杂 mco(NH22） K XH,o（n2 55 CO2 (g)+2NH3 (g)⎯⎯⎯ ⎯→  298K, Gm H2 O(l)+CO(NH2 )2 (l)  PCO = P 2  PNH = P 3 1 2 X H O =  mCO NH = m 2 2 ( )   r Gm = −RTLnK 杂 Kθ 杂 2 ( ) ( )( ) ( ) 2 3 2 2 2    P P P P m m X CO NH CO NH H O =