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# lec9 - P ben = 94.6 torr P tol = 29.1 torr Comparison to...

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1 ALL OTHER SECTIONS Meet in Sciences Lecture Hall Exam Room Assignments Section TA Room C13 Alexi 1051 SLB C14 Alexi 1059 SLB C16 Jeff 1067 SLB C17 Jeff 1075 SLB C06 Shirley 1068 SLB C07 Shirley 1076 SLB C15 Kathy 2051 SLB C09 Kathy 2059 SLB C02 Leah 2068 SLB C04 Leah 2076 SLB Announcements • REVIEW SESSION • Exam keys outside room 69 Chemistry • Exam on Friday covers: – Chapters 7, 12, and 13 Last Time • Concentration • Raoult’s law - P = X solvent x P pure • Freezing point depression - Δ T f = ik f x m • Raoult’s law for liquid/liquid mixtures Liquid/Liquid Mixtures • Components obey Raoult’s law P total = P A + P B = X A,liq P A,pure + X B,liq P B,pure • Ideal mixtures, gas phase – P A V = n A RT X A,gas = n A /(n A + n B ) = P A /( P A + P B ) = P A / P total

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2 Example Given that the total vapor pressure above a mixture of benzene (C 6 H 6 ) and toluene (C 7 H 8 ) liquids weighing 100 g is 63 torr and that X ben = .78 for the vapor, what is the mass of benzene liquid in the mixture? • Pure vapor pressures:
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Unformatted text preview: P ben = 94.6 torr P tol = 29.1 torr Comparison to Henry’s Law • Raoult’s Law – two components P total = P A + P B = X A,liq P A,pure + X B,liq P B,pure – vapor pressure above nearly a pure solvent • Henry’s Law – two components S = k H x P – solubility of vapor into a pure solvent 3 Fractional Distillation • Separation of liquid mixtures on basis of boiling point • Vapor is richer in more volatile component • Successive boiling and condensing steps Osmosis • Flow of solvent through a semi-permeable membrane into a solution – Driven by concentration differences – Solute blocks flow of solvent • Osmotic pressure – pressure to stop solvent flow Π = RT x molarity Consequences • Osmometry – determination of MW • Desalination – reverse osmosis • Cell nutrient regulation...
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lec9 - P ben = 94.6 torr P tol = 29.1 torr Comparison to...

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