Worksheet: Vapor Pressure

In this worksheet, we will practice using vapor pressures to compare the structures and intermolecular interactions of liquids.

Q1:

Which of the following variables does not affect the vapour pressure of a liquid in a closed container?

  • AAtmospheric pressure
  • BTemperature
  • CSolute concentration
  • DLiquid surface area
  • ERate of condensation

Q2:

Consider a binary liquid solution in which the constituent species are labeled A and B. Suppose that the A–B pairwise attractive interactions are stronger than the average of the A–A and B–B pairwise attractive interactions. Which of the following statements about the properties of this solution is not correct?

  • AThe vapor pressure of the solution will be less than 1 2 ( 𝑃 + 𝑃 ) A B when species A and B are present in equimolar amounts (where 𝑃 A and 𝑃 B denote the vapor pressures of pure liquid A and pure liquid B respectively).
  • BThe vapor pressure of the solution will exhibit negative deviations from Raoult’s law behavior.
  • CIf the mole fraction of species A ( 𝑋 ) A is much larger than the mole fraction of species B ( 𝑋 ) B , then the vapor pressure of B will follow Henry’s law behavior.
  • DThe vapor pressure of the solution will exhibit positive deviations from Raoult’s law behavior.

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