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when to place equilibrium constant in front concentration for Kc expression?

Discussion in 'DAT Discussions' started by Smooth Operater, Jul 20, 2006.

  1. Smooth Operater

    Smooth Operater don't bug "operatEr"!
    5+ Year Member

    May 22, 2004
    Likes Received:
    for rxn C(s) + CO(g) --> 2 CO(g), what is the concentration of CO at equilibirum if the CO2 concentration is 0.5 M?

    I am kinda confused about writing expression for equilibrium constant. How come in some questions, I need to place the stiochimetric coefficient in front the concentration like:

    Kc = 2[CO]^2/[CO2]

    and there are times that I don't need to place the coefficient to solve a problem correctly (such as this question) like:

    Kc = [CO]^2/[CO2]

    How some experts can clear it up. THANKS!
  2. Pdiddy310

    Pdiddy310 Med School 4.0
    10+ Year Member

    Nov 16, 2004
    Likes Received:
    Attending Physician
    i've always raised the concentration of reactants and products to the power of their respective stoichiometric ratios.

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