Lecture 3211/21/05 2 seminars left. London Dispersion Forces: Induced dipole / Induced dipole...
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Transcript of Lecture 3211/21/05 2 seminars left. London Dispersion Forces: Induced dipole / Induced dipole...
London Dispersion Forces:Induced dipole / Induced dipole
Non-polar / non-polar interaction
0.05 – 40 KJ/mol
Changes of State
Energy (ice melting) = mass x heat of Fusion For water: 333 J/g or 6 KJ/mol
Energy (boiling) = mass x heat of Vaporization For water: 2256 J/g or 40.65 KJ/mol
You put 1 L of water in a pan at 100˚C and the water evaporates. How much heat was needed to vaporize all of the water?
ΔVvap˚ = + 40.7 KJ/mol at 100˚C
Density of water = 0.958 g/mL at 100˚C
(Equilibrium) Vapor Pressure
Liquid Vapor
Volatility: Greater the volatility the bigger the vapor
pressure
If you put 2 L of water into a sealed room with a volume of 42500 L, will all of the water evaporate at 25˚C?
Assume density of water is 1 g/mL and vapor pressure is 0.0313 atm.