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Discussion :: Chemical Engineering Thermodynamics

  1. The reaction A (l) R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The number of degrees of freedom are

    2. A.

     1
    B.

     2
    C.

     3
    D.

     0

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    Answer : Option B

    Explanation :

    f=C−ϕ+2+ number of chemical reactions+ number of constraints
    ⇒ given number of components=3
    Number of phase =2,  number of independent chemical reactions =1,  number of constraints =1  (initially only A is present)
    So, f=2

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