2)△ ixH=0 HB =H B.m +0 aT P,nB,nc P,nB,nc T2 HB =HB.m △mixH=0 1616 2）ΔmixH=0 H B  H B,m 0 ( ) ( ) , , * , ,                   B C B C P n n B P n n B T T T T   2 , 2 T H T HB m B    H B  H B,m ΔmixH=0