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Discussion :: Chemical Engineering Thermodynamics

  1. The activity of an ideal gas is numerically __________ its pressure.

    2. A.

     More than
    B.

     Less than
    C.

     Equal to
    D.

     Data insufficient, can't be predicted

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    Answer : Option C

    Explanation :

    Activity (a) of a pure ideal gas is defined as:

    a=fugacity at an temperature and pressure of interestfugacity at same temperature and standard pressure 

    usually the, standard pressure = 1 atm and for ideal gas fugacity at a temperature and pressure = pressure at that conditions
    So, a=P

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