The stronger the intermolecular forces,the lower the vapor pressure of a substance at a given temperature.

Name: The stronger the intermolecular forces,the lower the vapor pressure of a substance at a given temperature.
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Stronger intermolecular forces mean that the molecules are more tightly held together, requiring more energy to escape into the vapor phase, thus resulting in a lower vapor pressure at a given temperature.

The Stronger the Intermolecular Forces,the Lower the Vapor Pressure of a Substance