Heat of vaporization and BP

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)

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

P1/P2= Delta Hvap/R(T1-T2/T1T2)

the temperature at which the vapor pressure of a liquid is equal to the external pressure

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

the process where molecules go directly from a solid into the vapor phase.

is the energy ( usually in KJ) required to melt one mole of a solid. Delta Hfus is smaller than Delta Hvap

the opposite of sublimation- molecules make the transition from vapor to solid directly

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