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Homework Help: Determining pressure at equilibrium with Kp

  1. Feb 21, 2012 #1
    1. The problem statement, all variables and given/known data
    The minerals (Fe2So3) and (Fe3O4) exist in equilibrium with atmospheric oxygen.

    4 Fe3O4(s) + O2(g) <----> 6 Fe2O3(s) kp = 2.5 x 10^87

    Determine P(O2) at equilibrium
    2. Relevant equations
    -----


    3. The attempt at a solution
    Since the equilibrium constant can only have gases in it, I assumed that the equation would be
    1/[O2]^2 so that the pressure would be 1/2.5*10^87. However, it's an online program and says that that (4*10^-88) is wrong. It also says that 2.5*10^87 is wrong. What else do you think I could do?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Feb 22, 2012 #2

    Borek

    User Avatar

    Staff: Mentor

    No idea why 1/[O2]2 and not just 1/[O2], but perhaps that's just a typo.

    Some of these HW programs are very anal about significant digits.
     
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