• 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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