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Homework Help: Help: Determining the equilibrium conversion and final pressure of a reacting system

  1. Dec 15, 2008 #1
    1. The problem statement, all variables and given/known data
    Reaction: A = B + C

    Reaction is run in an isothermal constant volume reaction vessel. Initially, before any reaction has occurred, the vessel is filled with pure A at 1 atm and 400K. The equilibrium conversion, epsilon and final pressure of the system is to be determined.

    2. Relevant equations

    I have no idea where to progress from where I am at. My attempt to the question is descried below.

    3. The attempt at a solution

    Component Initial Dissociation yi
    A 1 1-epsilon (1-eps)/(1+eps)
    B 0 epsilon eps/(1+eps)
    C 0 epsilon eps/(1+eps)

    Ka = Kp*Ky*Kf/Kf0

    Kf0 based on fugacity at 1 atm
    Kp = (P2/1)1
    Ky = (eps^2/(1+eps)^2)
    Kf = still unknown but based on (f/p)
    Ka = 1.0

    since ln(Ka1/Ka2) = integral(H/RT) dt = 0 for isothermal process

    Ka1 = Ka2 where Ka = 1 for standard state of p=1 atm and T = 400K

    Would anyone on here have any idea how to go about this question?
  2. jcsd
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