LECTURE5 - 1 Midterm 1 Monday Apr 18 th In class....

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Unformatted text preview: 1 Midterm 1 Monday Apr 18 th In class. Thermochemistry (chap 11) Liquids and Solids (chap 12) Solutions (chap 13) Sample exams on website – guide only Last Time A B ? H (AC) H (DB) H (CD) • Hess’s law: C D • Phase changes • Dynamic equilibrium • Vapor pressure… 2 Vapor Pressure • Vapor pressure : gas pressure above liquid • “Dynamic equilibrium” liquid vapor Mercury barometer Vapor pressure of liquid P vap independent of V liq P vap independent of V gas P vap dependent on T Vapor Pressure • 1 atm = 101325 Pa = 760 mm Hg = 760 Torr • Depends on T 3 Container open to atmosphere: • When vapor pressure equals 1 atm: Boiling occurs B.P. Boiling Point At low pressure liquid boils at lower temperature • At 1 atm liquids boil at T b ( normal boiling point ) Water: 100 ° C liquid vapor Vapor Pressure Curves (e) (d) (c) (b) (a) ln P = A ( ) + B 1 T A = Δ H vap R ln = ( ) P 2 P 1 1 T 2 1 T 1 Δ H vap R Clausius-Clapeyron Equation:...
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This note was uploaded on 07/09/2011 for the course CHE 2B 2B taught by Professor Tobyallen during the Spring '11 term at UC Davis.

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LECTURE5 - 1 Midterm 1 Monday Apr 18 th In class....

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