VA+VR △SA=naRn △SB=ngRLn △S=△SA+ASB -aRa,ap, VA =-nARLnyA-nBRLnyB>0 y为摩尔分数 3 3 ΔS A = nA RLn A A B V V +V ΔSB = nB RLn B A B V V +V ΔS=ΔS A +ΔSB = - nA RLn A B A V V V + - nB RLn A B B V V V + = - nA RLnyA- nB RLnyB > 0 y 为摩尔分数