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Homework Help: Thermodynamics - Gas Mixtures

  1. Aug 4, 2009 #1
    A mixture of hydrocarbon gases is composed of 60% methane, 25% propane, and 15%
    butane by weight. This mixture is compressed from 100 kPa and 20ºC to 1000 kPa in a
    reversible, isothermal, steady-flow compressor. Determine the work and heat transfer
    for this compression per unit mass of the mixture.
  2. jcsd
  3. Aug 5, 2009 #2
    If you are asking for help obtaining a solution to this problem, you must show your attempt at a solution first.
  4. Aug 5, 2009 #3
    hi there... i just cant figure out where to start... perhaps... should be using few of these equations : -

    W in = q out + (h2 - h1)
    Win = Q out
    since it's isothermal, T1 = T2, change of KE and PE will be negligible
    steady flow , mass flow rate will be constant

    i just.. blurred.... i hope there's enlightment.... i need to submit this on coming friday.

    thank you
  5. Aug 6, 2009 #4


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    I would calculate Win here.

    For that, you'd need to figure out how pressure varies with the volume of a unit mass -- say 1 kg -- along the path described.
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