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Discussion :: Chemical Engineering Thermodynamics

  1. The internal energy of a gas obeying P (V - b) RT (where, b is a positive constant and has a constant Cv), depends upon its

    2. A.

     Pressure
    B.

     Volume
    C.

     Temperature
    D.

     All of the above

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    Answer : Option C

    Explanation :

    The internal energy of an gas is given by:
    dU=CvdT−[P+T((∂V∂T)p(∂V∂P)T)dV]⇒dU=CvdT+[T(∂p∂TV)−p]using the given equation:P(v−b)=RT⇒∂P∂T=RV⇒dU=cvdT
    Hence internal energy is only a function of temperature.

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