What happens to freezing point of benzene when small quantity of naphthalene is added to benzene?

Question

Canvas Classes · Accepted Answer

Strategy:
 According to Raoult's Law, the vapor pressure of a solution () is the vapor pressure of the pure solvent () multiplied by its mole fraction ().

Analysis:
1. A non-volatile solute takes up space at the surface but doesn't contribute to vapor.
2. Thus, the escape frequency of solvent molecules is reduced.
3. . Since , the vapor pressure is always lowered.

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