The heat required to change a substance from the liquid to the vapor state is referred to as the
A) heat of fusion.
B) heat of vaporization.
C) heat of evaporation.
D) heat of condensation.
E) heat of melting.

Question

Quizplus · Accepted Answer

The heat required to change a substance from the liquid to the vapor state is referred to as the heat of vaporization. This is because it takes a certain amount of energy to overcome the intermolecular forces holding the liquid together and turn it into a gas. The heat of vaporization is a characteristic property of each substance and is typically measured in units of J/g or kJ/mol.

The Heat Required to Change a Substance from the Liquid