The Chemical Potential and Phase Equilibria

Consider a closed system consistmgof two phases m equilibrium. Within this closed system, each individual phase is an open system, free to transfer mass to the otlier. Equation (11.2) may be written for each phase  

The change in the total Gibbs energy of the two-phase system is the smn of these equations. When each total-system property is expressed by an equation of the fonn. 

Since the two-phase system is closed, Eq. (6.6) is also valid. Comparison of the two equations shows that at equdibrinin  

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