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Homework Help: Thermodynamics problem with relative humidity

  1. Apr 24, 2010 #1
    1. The problem statement, all variables and given/known data

    After taking a deep breath, the mass of air expelled when I exhale is approximately 2.5g. The intake air is at 18deg dry bulb temperature at 60% relative humidity, and the air exhaled is at 100% relative humidity at a temperature of 32deg. The net mass of water expelled during one breathing cycle is (in mg)

    a)49
    b)58
    c)65
    d)73
    e)81


    2. Relevant equations



    3. The attempt at a solution

    I used the psychometric chart, and I found the M.C for both cases and calculated the mw for inhaling and exhaling, found the difference, but my answer was not the same as the answer given.

    could someone please show me to how to do this question cheers
     
  2. jcsd
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