Which of the following statements is true regarding vapor pressure depression? (

Question

Which of the following statements is true regarding vapor pressure depression?
(Be careful that you choose the correct description given in lecture and in our text, as some of these choices are incorrect explanations commonly found online).

   Solutions have additional solute molecules which add to the intermolecular forces of attraction keeping liquid molecules in solution. This means it takes more energy for liquid molecules to escape to the gas phase as they need to overcome additional intermolecular forces.
  

Solutions typically have a higher entropy than pure solvents. The solution is entropically more favorable, and thus liquid molecules are less likely to evaporate than in pure water.
  

Vapor Pressure Depression occurs because solute particles block the surface of a solution, impeding the ability for liquid molecules to become a gas.

Solutes cause the boiling point of the solvent to become depressed, meaning the solution will be cooler and thus have a lower vapor pressure.

Explanation / Answer

Vapor Pressure Depression occurs because solute particles block the surface of a solution, impeding the ability for liquid molecules to become a gas.

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