Lecture_05

B b a a now at equilibrium we may write p p g sol g

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Unformatted text preview: ion is: G = = G > (or l = = l > ) and G = = G > (or l = = l > ). B B B B A A A A 10 5.7. Raoult’s Law and Activities Consider a binary system consisting of a solution and a vapor phase, each containing components A and B. The equilibrium condition is: G sol = G vap (or l sol = l vap ) and G sol = G vap (or l sol = l vap ). B B B B A A A A If the vapor phase behaves ideally, we may write P P G vap = G ,vap + n A RT ln æ PA ö , and G vap = G ,vap + n B RT ln æ PB ö . B B A A ø è è ø Now, at equilibrium, we may write P P G sol = G ,vap + n A RT ln æ PA ö , and G sol = G ,vap + n B RT ln æ PB ö , or B B A A ø è è ø (5.70,5.71) PA ö PB ö l sol = l ,vap + RT ln æ P  ø and l sol = l ,vap + RT ln æ P  ø . B B A A è è For the pure liquids in equilibrium with their vapors, we write P P l  = l ,vap + RT ln æ PA ö and l  = l ,vap + RT ln æ PB ö B B A A è ø è ø (5.72) From the last two equations, we write (all equations written for co...
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