A principle to correlate extreme values of excess thermodynamic functions with partial molar quantities  

作　　者：尉志武 刘芸 周蕊 薛芳渝 

出　　处：《Science China Chemistry》2001年第3期315-319,共5页中国科学（化学英文版）

基　　金：Acknowledgements Authors gratefully thank Prof. Li, Y. G. for his discussion. This work was partially supported by the National Natural Science Foundation of China (Grant No. 29973019) and Basic Research Fund of Tsinghua University.

摘　　要：Excess thermodynamic properties are widely used quantitatively for fluids. It was found that at constant temperature and pressure a molar excess quantity of a mutually miscible binary mixture at the extreme points equals the excess partial molar quantities of the two components, i.e.F E 1=F E 2=F E m, forming a triple cross point. The relationship is hold for properties such as enthalpy, entropy, Gibbs free energy, and volume, and is applicable for excess functions with multi extreme points. Solutions at extreme points can be referred to as special mixtures. Particularly for a special mixture of Gibbs free energy, activity coefficients of the two components are identical.Excess thermodynamic properties are widely used quantitatively for fluids. It was found that at constant temperature and pressure a molar excess quantity of a mutually miscible binary mixture at the extreme points equals the excess partial molar quantities of the two components, i.e.F₁^E = F₂^E = F_m^E , forming a triple cross point. The relationship is hold for properties such as en-thalpy, entropy, Gibbs free energy, and volume, and is applicable for excess functions with multi extreme points. Solutions at extreme points can be referred to as special mixtures. Particularly fora special mixture of Gibbs free energy, activity coefficients of the two components are identical.

关 键 词：EXCESS properties Gibbs energy activity coefficient ENTHALPY TRIPLE cross point 

分 类 号：O642[理学—物理化学]