《物理化学 Physical Chemistry》课程教学资源（英文版）Phase Equilibrium（Phase Diagrams）

Boiling pt /Composition Diagram Tb个 * for the liquid vapor with composition x A boiling pt of pure B g boilins pt. of * B liquid pure A composition of the vapor that boils off A A at t XA→

Boiling Pt./Composition Diagram liquid xA Tb  vapor TA * TB * yA xA → Tb for the liquid with composition xA composition of the vapor that boils off at Tb boiling pt. of pure A boiling pt. of pure B

Lever rule let za be the total mole fraction of A. both phase a phases combined Let n and n be the phase p moles in phases a and阝 nza naXa t nByA noza+ nBZA AAA n 阝yA yA X

Lever Rule • Let z be the total mole fraction of A, both phases combined. • Let n and n be the moles in phases  and . • nz = nx + nyA = nz + nzA • n (z-x) = n (y-z) • n l = n l zA phase  phase  l l T yA xA