Summary:

Energy is absorbed in the process of converting a liquid at its boiling point into a gas.
As a gas condenses to a liquid, heat is released.
The molar heat of vaporization is the heat absorbed by one mole of that substance.
When 1 mol of water vapor at 100°C condenses, 40.7 kJ of heat are released into the surroundings.
The values of the heats of fusion and vaporization are related to the strength of the intermolecular forces.
All of the substances in the table above, with the exception of oxygen, are capable of hydrogen bonding.

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