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Homework Help: Molar Entropy Of A Gas

  1. Apr 21, 2010 #1
    1. The problem statement, all variables and given/known data
    Show that the molar entropy of a gas is given by;

    5Cfrac%7B5%7D%7B2%7D%20%2B%20%20%5Cfrac%7B3%7D%7B2%7Dln%5Cfrac%7B2%5Cpi%20mk%7D%7Bh%5E2%7D%20%5D.jpg


    2. Relevant equations

    latex2png.2.php?z=100&eq=S%20%3D%20(%5Cfrac%7B%5Cpartial%20F%7D%7B%5Cpartial%20T%7D)_v.jpg

    latex2png.2.php?z=100&eq=F%20%3D%20-KT%20lnZ.jpg


    3. The attempt at a solution

    I've tried this numerous times. The first part of the question involved getting ln Z for the hemholtz free energy which was found to be;

    &eq=ln%5B%5Cfrac%7BeV%7D%7BN%7D(%5Cfrac%7B2%5Cpi%20mkt%7D%7Bh%5E2%7D)%5E%5Cfrac%7B3%7D%7B2%7D%5D.jpg

    The 3/2 is a power. I have tried this numerous times and still unable to get the result mentioned.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 21, 2010 #2

    Mapes

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Can you show your steps? It's just a matter of differentiating F and playing with a few terms. Also, [itex]S=-(\partial F/\partial T)_V[/itex].
     
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