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Specific heat.

  1. Apr 25, 2007 #1
    1. The problem statement, all variables and given/known data
    For a gas of molar mass M, Cp/Cv=y. Find specific heat at constant pressure.



    3. The attempt at a solution

    [tex]C_p=\frac{Pdv}{ndt}+C_v[/tex]
    PV=nRT,
    P=constant
    [tex]\frac{P}{n} \frac{dv}{dt}=R[/tex]

    Substituting in the above equation:
    [tex]C_p(\frac{y-1}{y})=R[/tex]
    [tex]C_p=\frac{Ry}{y-1}[/tex]

    This isnt the answer though, the given answer is [tex]C_p=\frac{Ry}{M(y-1)}[/tex]. Why? How does M come into the picture?
     
  2. jcsd
  3. Apr 26, 2007 #2
    Anybody? Please?
     
  4. Apr 26, 2007 #3

    Mentz114

    User Avatar
    Gold Member

    Have you checked your units ? Your proposed answer has the wrong dimensions.
     
  5. Apr 27, 2007 #4
    Where have I made the mistake? What am I doing wrong?
     
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