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Discussion :: Chemical Engineering Thermodynamics

  1. __________ does not change during phase transformation processes like sublimation, melting & vaporisation.

    2. A.

     Entropy
    B.

     Gibbs free energy
    C.

     Internal energy
    D.

     All of the above

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    Answer : Option B

    Explanation :

    Since during phase change the temperature and pressure remains constant we can say the gibbs free energy remains constant and the relation is given by:
    For single component and closed system : dG=VdP−SdT

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