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Discussion :: Chemical Engineering Thermodynamics

  1. Free energy

    2. A.

     Decreases in all spontaneous (or irreversible) processes
    B.

     Change during a spontaneous process has a negative value
    C.

     Remains unchanged in reversible processes carried at constant temperature and pressure
    D.

     All of the above

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    Answer : Option D

    Explanation :

    Since for an spontaneous process s>dU+PdV
    For, constant temperature and constant pressure process the above equation can be written as
    d(TS−U)>PdV⇒d(−A)>PdV⇒(dG)T,P<0.
    For spontaneous process (irreversible). And (dG)T,P=0   for, a reversible process.

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