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Ideal gas question. Please Urgent help needed

  1. Apr 25, 2007 #1
    The relative humidity is 55% on a day when the temperature is 30.0°C. Using the graph below, determine the number of moles of water vapor per cubic meter of air.

    on the graph, Vapor pressure of water is on the y-axis and temperature on the x-axis 30C cordinates with 4200 Pa of water vapor.

    This how i tried to sove it.

    Since 30 corresponds to 4200 Pa

    T in Kelvin =303
    n/v = p/RT
    =4200/(8.32 x 303)
    = 1.67
  2. jcsd
  3. Feb 12, 2009 #2
    I need help with this same problem...


    That is the graph, if anyone can help.

    EDIT... I really don't know where to start at all. I tried to do it (almost) the same way as owura, but I couldn't figure it out how to find it in "mol/m^3".
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