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Discussion :: Chemical Engineering Thermodynamics

  1. A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is

    2. A.

     Zero
    B.

     Positive
    C.

     Negative
    D.

     None of these

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    Answer : Option C

    Explanation :

    Since for an spontaneous process TdS>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.

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