What is the relationship between polarity and vapor pressure?
A) These two properties are unrelated.
B) The more polar the molecule, the higher the vapor pressure.
C) The less polar the molecule, the higher the vapor pressure.
D) Nonpolar molecules have lower vapor pressures.
E) The relationship changes depending upon the temperature.

Question

Quizplus · Accepted Answer

The less polar the molecule, the higher the vapor pressure because nonpolar molecules have weaker intermolecular forces, so they escape into the gas phase more easily. Therefore, they have higher vapor pressures. Conversely, polar molecules have stronger intermolecular forces, so they are less likely to escape into the gas phase and have lower vapor pressures.

What Is the Relationship Between Polarity and Vapor Pressure