X X 1-X P 10+XP8 X2 P (1-X)10+X)P P=P9,K8=0.178,X=0.728 若不加H,0(gK= X12 X=0.389 1-X)1+X) 22 22     P P X X P P X X P P X X KP + − + + = 10 1 ) 10 )( 10 (  P P X X X (1 )(10 ) 2 − + =  P = P , = 0.178  KP , 若不加 H2O（g） (1 ')(1 ') ' 2 X X X KP − + =  X' = 0.389 X=0.728