CHEM 1032 Lecture Notes - Lecture 4: Jmol, Intermolecular Force, Gas Constant

• School: Temple University
• Department: Chemistry
• Course: CHEM 1032
• Professor: Elizabeth Cerkez

Document Summary

Vapor pressure and temperature have an exponential relationship. Pvap = exp (- hvap/rt: pvap = vapor pressure, exp = constant, r = gas constant 8. 314 j/mol, t = kelvin. Clasius capeyron equation ln pvap = (- hvap/r)(1/t)+ln . Y=mx+b ln p2/p1 = (- hvap/r)(1/t2 1/t1) Sublimation: solid gas, some molecules in the solid have enough thermal energy from intermolecular forces. Ones on the surface: surface molecules are most likely to break off. Deposition: gas solid, if a slow moving gas molecule that comes into contact with a solid surface, dynamic equilibrium. Pressure of the gas is the vapor pressure of the solid: dry ice solid co2. Solid liquid: if you increase the temperature of the solid, you will increase the thermal energy of the molecules. Opposite is freezing: molecules slow and intermolecular forces hold them stationary. At melting point, temperature will stay constant until everything has undergone transition.