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Homework Help: Liquid-Vapor equilibrium

  1. Jan 13, 2016 #1
    1. The problem statement, all variables and given/known data
    A liquid is in equilibrium with its vapor at its boiling point. On an average, the molecules in the two phases have equal:
    (A) inter-molecular forces
    (B) potential energy
    (C) total energy
    (D) kinetic energy

    2. Relevant equations

    3. The attempt at a solution
    I know (A) is wrong as intermolecular forces in liquids are much more than those in gases. However, I'm confused between (B) (C) and (D). I know in gases KE is directly proportional to temperature. I'm not really sure about anything beyond this.
  2. jcsd
  3. Jan 13, 2016 #2


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    Okay --- it's not KE. That leaves PE and TE; do you think TE might be related more to KE than PE? Or, less?
  4. Jan 13, 2016 #3
    Why isn't it KE? Shouldn't KE also be proportional to temperature in liquids?
    And I don't know whether TE might be more related to KE or PE.
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