Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.

Start Practicing

Worksheet: Vapor Pressure

Q1:

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 incorrect?

  • AThe vapor pressure of the solution will be less than 1 2 ( ๐‘ƒ + ๐‘ƒ ) A B โˆ— โˆ— when species A and B are present in equimolar amounts (where ๐‘ƒ A โˆ— and ๐‘ƒ B โˆ— denote the vapor pressures of pure liquid A and pure liquid B, respectively).
  • BThe vapor pressure of the solution will exhibit negative deviations from Raoultโ€™s law behavior.
  • CIf the mole-fraction of species A ( ๐‘‹ ) A is much larger than the mole-fraction of species B ( ๐‘‹ ) B , then the vapor pressure of B will follow Henryโ€™s law behavior.
  • DThe vapor pressure of the solution will exhibit positive deviations from Raoultโ€™s law behavior.

Q2:

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

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