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lec9_whc

# lec9_whc - Exam Jan 29 Room Assignments Room 1051 SLB 1059...

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Exam Jan. 29; Room Assignments ALL OTHER SECTIONS ( B01, B03, B05, B08, B10, B11, B13, B18, B19, BR0 ) Meet in Sciences Lecture Hall Edna B06 2076 SLB Edna B02 2068 SLB James B15 2059 SLB James B09 2051 SLB Mateo B16 1076 SLB Mateo B12 1068 SLB Troy B20 1075 SLB Troy B04 1067 SLB Kelly B17 1059 SLB Kelly B07 1051 SLB TA Section Room

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Last Lecture • Concentration Scales • Henry's Law for partitioning of a gas to a solvent • Raoult’s law - P = X solvent · P o pure • Fractional Distillation
Raoult's Law describes an ideal solution of component A into B. The vapor phase is enriched in the more volatile component in the mixture.

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Example 13.6–7 e.g. Solution of benzene and toluene contains 0.5 mol fraction of benzene. What is the partial pressure of each component in the vapor? benz = 95.1 mmHg; tolu = 28.4 mmHg P benz = x benz,liq benz = 0.5 x 95.1 mmHg = 47.6 mmHg P tolu = x tolu,liq tolu = 0.5 x 28.4 mmHg = 14.2 mmHg P total = P benz + P tolu = 61.8 mmHg What is the mole fraction of benzene in the vapor? x benz,gas = P benz / P total = 47.6 mmHg/61.8mmHg = 0.77 Therefore, vapor is richer in more volatile component – benzene. Enrichment Æ enables distillation.

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Liquid-Vapor Equilibrium Vapor pressure as function of liquid composition Vapor pressure as function of vapor composition Liquid (3) x=0.5 in equilibrium with vapor (4) x=0.77 Æ tie line
Boiling Point and Composition

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Fractional Distillation • Separation of liquid mixtures on basis of boiling point • Vapor is richer in more volatile component • Successive boiling and condensing steps
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lec9_whc - Exam Jan 29 Room Assignments Room 1051 SLB 1059...

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