Heat of vaporization and BP
Home > Preview
The flashcards below were created by user
on FreezingBlue Flashcards.
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)
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
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
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
What would you like to do?
Home > Flashcards > Print Preview