Phase Equilibrium
- Colligative Properties
- Henry's Law and Raoult's Law
- Phase Diagrams
- Phase Equilibrium
- Phase Transitions
- Vapour Pressure
Enthalpy of Vaporization and Condensation
Definition
The enthalpy of vaporization is the amount of heat that must be absorbed to keep the liquid at a constant temperature when a given quantity is vaporized
Conversely, the enthalpy of condensation is the amount of heat that must be released to keep the liquid at a constant temperature when a given quantity is condensed
Equation
Note that
Enthalpies of Vaporization at 298K
Trend: as intermolecular forces increase, so does the change in enthalpy
Phase Equilibrium
Definition
During phase equilibrium there is no net conversion from one phase to another. That is, speed of conversions between the two states is the same.
The pressure of water vapour at equilibrium is its vapour pressure