# Heat of vaporization and BP

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1. molar heat of vaporization (Delta Hvap)
the energy (usually in KJ) required to vaporize 1 mole of liquid. Directly related to the strength of the intermolecular forces that exist in the liquid

the clauses claperon equation measures Hvap

ln P1/P2= Delta Hvap/ R (T1-T2/T1T2)
2. equilibrium vapor (vapor pressure)
the rate of evaporation is constant at any given temperature. the vapor pressure measured when a dynamic equilibrium exists between condensation and evaporation. It is the maximum vapor pressure at a given temperature
3. Clasius Claperon Equation
P1/P2= Delta Hvap/R(T1-T2/T1T2)
4. boiling point
the temperature at which the vapor pressure of a liquid is equal to the external pressure
5. Liquid - Solid Equilibrium:
melting point or freezing point
melting point of a solid or the freezing point of a liquid is the point at which solid and liquid phases coexist in equilibrium.

water and ice at 0 degrees celcius and 1atm
6. sublimation
the process where molecules go directly from a solid into the vapor phase.
7. molar heat of fusion (Delta Hfus)
is the energy ( usually in KJ) required to melt one mole of a solid. Delta Hfus is smaller than Delta Hvap
8. Deposition
the opposite of sublimation- molecules make the transition from vapor to solid directly
9. Molar heat of sublimation (Delta H sub)
the energy (usually in KJ) required to sublime 1 mole of a solid. It is equal to the sum of of the molar heats of fusion and vaporization

Delta Hsub= Delta H fus + Delta H vap
 Author: Anonymous ID: 81200 Card Set: Heat of vaporization and BP Updated: 2011-04-23 01:21:39 Tags: Heat Vaporization BP Folders: Description: /\HVap and BP Show Answers: