# Heat of vaporization and BP

 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) 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 Clasius Claperon Equation P1/P2= Delta Hvap/R(T1-T2/T1T2) boiling point the temperature at which the vapor pressure of a liquid is equal to the external pressure 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 sublimation the process where molecules go directly from a solid into the vapor phase. 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 Deposition the opposite of sublimation- molecules make the transition from vapor to solid directly 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 AuthorAnonymous ID81200 Card SetHeat of vaporization and BP Description/\HVap and BP Updated2011-04-23T01:21:39Z Show Answers