Which of the following statements is true according to Raoult's Law?

1 question

The vapor pressure of a solution is always higher than that of the pure solvent.
The vapor pressure of a solution is lower than that of the pure solvent.
Raoult's Law applies only to ideal solutions.
The mole fraction of solute affects the vapor pressure of the solvent.

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Q: Which of the following statements is true according to Raoult's Law?

Solution: Raoult's Law indicates that the vapor pressure of a solution is lower than that of the pure solvent due to the presence of solute.

Steps: 6

Step 1: Understand what vapor pressure is. Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid phase.
Step 2: Know what a pure solvent is. A pure solvent is a liquid that has no solute mixed in it.
Step 3: Learn about a solution. A solution is made when a solute (like salt or sugar) is mixed with a solvent (like water).
Step 4: Recognize that adding a solute to a solvent changes the properties of the solvent.
Step 5: According to Raoult's Law, when a solute is added to a solvent, the vapor pressure of the resulting solution is lower than the vapor pressure of the pure solvent.
Step 6: This happens because the solute particles take up space at the surface of the liquid, making it harder for solvent molecules to escape into the vapor phase.