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Discussion :: Chemical Engineering Thermodynamics

  1. What is the value of ln y (where y = activity co-efficient) for ideal gases?

  2. A.

     Zero

    B.

     Unity

    C.

     Infinity

    D.

     Negative

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    Answer : Option A

    Explanation :

    Since activity co-efficient is defined as
    γi=Fugacity in real solutionFugacity in ideal solution,lnγ1=¯nGElRT=0(for ideal solution),
    Since there will be no excess gibbs free energy for ideal solution.
    So, in the question it will be better if replace ideal gas by ideal solution.


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