What is the relationship between the vapor pressure of a solution and the mole f

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Question: What is the relationship between the vapor pressure of a solution and the mole fraction of the solvent? (2023)

Options:

Correct Answer: Directly proportional

Exam Year: 2023

Solution:

The vapor pressure of a solution is directly proportional to the mole fraction of the solvent.

What is the relationship between the vapor pressure of a solution and the mole fraction of the solvent? (2023)

What is the relationship between the vapor pressure of a solution and the mole fraction of the solvent? (2023)

Step 1: Understand what vapor pressure is. Vapor pressure is the pressure exerted by the vapor of a liquid when it is in equilibrium with its liquid phase.
Step 2: Know what a solution is. A solution is a mixture of a solute (the substance being dissolved) and a solvent (the substance doing the dissolving).
Step 3: Identify the mole fraction of the solvent. The mole fraction is a way to express the concentration of a component in a mixture. It is calculated by dividing the number of moles of the solvent by the total number of moles of all components in the solution.
Step 4: Learn about the relationship. The vapor pressure of a solution decreases when a solute is added because the solute particles take up space at the surface of the liquid, reducing the number of solvent molecules that can escape into the vapor phase.
Step 5: Understand direct proportionality. When the mole fraction of the solvent increases (meaning there are more solvent molecules compared to solute), the vapor pressure increases. This means that the vapor pressure is directly proportional to the mole fraction of the solvent.

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