On a relative basis,the weaker the intermolecular forces in a substance,
A)the greater its heat of vaporization
B)the more it deviates from ideal gas behavior
C)the greater its vapor pressure at a particular temperature
D)the higher its melting point
E)none of these

Question

Quizplus · Accepted Answer

The weaker the intermolecular forces, the less energy is required for molecules to escape into the gas phase, which results in a higher vapor pressure. Therefore, choice C is the correct option. The heat of vaporization (choice A), deviation from ideal gas behavior (choice B), and melting point (choice D) are affected by intermolecular forces, but not in a way that is consistent with the statement in the question. Therefore, they are incorrect options.

On a Relative Basis,the Weaker the Intermolecular Forces in a Substance