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Homework Help: Humidity Controlled Oven

  1. Sep 7, 2011 #1

    This is my first post on here, so thank you in advance for your help.

    1. The problem statement, all variables and given/known data

    I have an air tight vessel that has a volume of 1m^3. The bottom of the vessel has water in it. What internal pressure is needed inside the vessel to achieve a temperature of 45C and 75% Relative Humidity? Also, what is the partial pressure of water vapor at that condition?

    2. Relevant equations

    None Given.

    3. The attempt at a solution

    I can't figure out how to figure out the mass/moles of water vapor in the air in order to figure out partial pressure and, thus, the relative humidity. I can't figure out how to get the overall pressure without knowing the mass/moles of water vapor in the air either. So I just need to know how to get started and i think I can finish it.

    again, thanks for your help.
  2. jcsd
  3. Sep 7, 2011 #2
    Anyone have any ideas at all?

    I think the real question is, based on Temperature and Pressure, how do I know how much water is in the air??

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