What is the effect of adding a non-volatile solute to a solvent on the vapor pre

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Question: What is the effect of adding a non-volatile solute to a solvent on the vapor pressure of the solvent?

Options:

Correct Answer: It decreases the vapor pressure.

Solution:

Adding a non-volatile solute decreases the vapor pressure of the solvent due to the reduction in the mole fraction of the solvent.

What is the effect of adding a non-volatile solute to a solvent on the vapor pressure of the solvent?

What is the effect of adding a non-volatile solute to a solvent on the vapor pressure of the solvent?

Step 1: Understand what a solvent is. A solvent is a substance, usually a liquid, that dissolves a solute.
Step 2: Know what a non-volatile solute is. A non-volatile solute is a substance that does not easily evaporate into a gas.
Step 3: Recognize that when you add a non-volatile solute to a solvent, you are mixing two substances together.
Step 4: Realize that the presence of the solute means there are fewer solvent molecules available to escape into the vapor phase.
Step 5: Understand that vapor pressure is the pressure of the vapor above a liquid in a closed container.
Step 6: Conclude that because there are fewer solvent molecules escaping, the vapor pressure of the solvent decreases.

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