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Discussion :: Chemical Engineering Thermodynamics

  1. In any spontaneous process,

    2. A.

     Only F decreases
    B.

     Only A decreases
    C.

     Both F and A decreases
    D.

     Both F and A increase

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    Answer : Option C

    Explanation :

    For any spontaneous process there should be finite changes so, we can consider it as an irreversible process and we know for irreversible process from second law of thermodynamics TdS−dU−PdV>0
    Under constant temperature and volume process −dF>0⇒dF<0
    Similarly for an constant temperature and pressure process
    d(TS−U−PV)>0⇒dG=0

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