化学反应系统的吉布斯自由能随反应进度变化的讨论

Discussion on the Change of Gibbs Free Energy with Extent of Reaction in Chemical Reaction System

化学反应通常发生在多组分系统中,因此在使用热力学判据来判断反应的方向和限度时,需要使用偏摩尔量来进行有关计算,而吉布斯自由能的偏摩尔量就是化学势。在等温、等压和不做非体积功的条件下,对于有限量的化学反应封闭系统,随着反应的进行,化学势将发生变化。本文以化学反应系统中1 mol理想气体的吉布斯自由能随反应进度变化的情况为例,说明在判断反应进行的方向和限度时,■和■是完全等效的。

Chemical reactions usually occur in multicomponent systems,so partial molar quantities are used to carry on calculations when thermodynamic criterion is used to determine the direction and limits of chemical reactions,and partial molar Gibbs free energy is chemical potential.Under the conditions of isothermality,isobar and no non-volume work,chemical potential will change with reaction proceeding for closed systems of chemical reactions containing a finitenumber of substances.In this paper,taking the Gibbs free energy of 1 mol ideal gas in chemical reaction system as an example,it is shown thate,it is shown that,(■G/■ζ)ГP,∑VBμB and (△ГGm)T,p are completely equivalent in determining the direction and limit of the reaction.