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Change of entropy

  1. Sep 17, 2009 #1
    I would like to find change of entropy of composite of two ideal gases which have sane tenperature and preasure and different volumes [tex]V_1[/tex] and [tex]V_2[/tex].

    I think about this and I have idea but I'm not sure am I right?

    Equation of state of ideal gas is

    [tex]PV=RT[/tex]

    And we have

    [tex]Tds=C_VdT+PdV[/tex]

    [tex]P=\frac{RT}{V}[/tex]

    [tex]dS=C_V\frac{dT}{T}+RT\frac{dV}{V}[/tex]

    First term is equal to zero!

    [tex]dS=RT\frac{dV}{V}[/tex]

    I think now that change of entropy is

    [tex]S=\int^V_{V_1}RT\frac{dV}{V}+\int^V_{V_2}RT\frac{dV}{V}[/tex]

    This is change of entropy! Am I right?

    Can I use that

    [tex]V=V_1+V_2[/tex] ?
     
  2. jcsd
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