Lecture 1a (Vapor Pressure)

2 Pages

Chemistry & Chemical Biology
Course Code
CHEM 1214
Thomas Gilbert

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Lecture 1 (1/7/2013) • Vapor Pressure: o Vapor Pressure:  Pressure exerted by a gas in equilibrium with its liquid.  Rates of evaporation and condensation are  equal.  PV = nRT  P = nRT / V   Generally, vapor pressure of solution is lower than vapor pressure  of pure solvent.  Number of particles affect vapor pressure (type of particles does  not matter) • Factor Affecting Vapor Pressure o Temperature:  Higher temperature = higher kinetic energy; more molecules with  sufficient kinetic energy to overcome attractive forces in liquid  phase. o Intermolecular Forces:  Must be overcome for molecules to leave the liquid and enter gas  phase.  Review of the types and relative strengths • Vapor Pressure of Solutions: o Raoult
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