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Discussion :: Chemical Engineering Thermodynamics

  1. For an ideal gas, the internal energy depends upon its __________ only.

    2. A.

     Molecular size
    B.

     Temperature
    C.

     Volume
    D.

     Pressure

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    Answer : Option B

    Explanation :

    Actually the internal energy (U) of a substance is a function of dU=CvdT−[P+T((∂V∂T)P(∂V∂P)T)dV]

    For an ideal gas, PV=RT

    So, (∂V∂T)P=RP   and  (∂V∂P)T=−RTP2
    Hence, dU=CvdT
    So, Internal energy of an ideal gas is purely a function of temperature. (Here the CV is considered only as a function of temperature which is satisfied by many of the substances.)

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