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Discussion :: Chemical Engineering Thermodynamics

  1. The internal energy of an ideal gas is a function of its __________ only.

    2. A.

     Molecular size
    B.

     Volume
    C.

     Pressure
    D.

     Temperature

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    Answer : Option D

    Explanation :

    The internal energy of an substance is given by
    dU=CvdT−[P+T((∂V∂T)p(∂V∂P)T)dV]For an ideal gas, PV=RTSo, (∂V∂T)p=RPand (∂V∂P)T=−RTP2Hence, dU=CvdT
    So internal energy is only an function of temperature.

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