What is the primary reason for the lowering of vapor pressure in a solution?

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Question: What is the primary reason for the lowering of vapor pressure in a solution?

Options:

Correct Answer: Presence of solute particles

Solution:

The presence of solute particles reduces the number of solvent molecules at the surface, leading to a lower vapor pressure.

What is the primary reason for the lowering of vapor pressure in a solution?

What is the primary reason for the lowering of vapor pressure in a solution?

Correct Answer: The presence of solute particles reduces the number of solvent molecules at the surface, leading to a lower vapor pressure.

Step 1: Understand what vapor pressure is. It is the pressure exerted by the vapor of a liquid when it is in equilibrium with its liquid phase.
Step 2: Know that a solution is made up of a solvent (the main liquid) and a solute (the substance dissolved in the solvent).
Step 3: When you add solute particles to the solvent, they mix together.
Step 4: The solute particles take up space at the surface of the liquid, where evaporation occurs.
Step 5: Because there are solute particles at the surface, there are fewer solvent molecules available to escape into the vapor phase.
Step 6: With fewer solvent molecules escaping, the vapor pressure of the solution is lower than that of the pure solvent.

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