The normal boiling point occurs when the
A)intermolecular forces within the liquid phase are broken.
B)temperature of the pure liquid equals the external temperature.
C)vapor pressure of a pure liquid equals an external pressure of one atmosphere.
D)vapor pressure of the liquid equals the external pressure.

Question

Quizplus · Accepted Answer

The normal boiling point is defined as the temperature at which the vapor pressure of a pure liquid equals the external pressure of one atmosphere. This occurs when there is enough thermal energy to overcome the intermolecular forces in the liquid, resulting in the molecules escaping into the gas phase. Therefore, choice C is the best answer.

The Normal Boiling Point Occurs When the