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    danid215's Avatar
    danid215 Posts: 1, Reputation: 1
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    #1

    Mar 29, 2011, 02:42 PM
    How to solve for a concentration using equilibrium constant?
    Given the balanced equation 2 H2 + 1 O2 <-> 2 H2O

    The equilibrium constant for the reaction is 9.4 x 10^13. If the equilibrium concentration if water vapor is 1.82M, what is the concentration of water?

    Please help as soon as possible. I am so lost, please explain with detail.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Mar 29, 2011, 10:14 PM

    Simply use the equilibrium expression.



    Let x be a certain concentration, that of oxygen.
    The concentration of H2 will be 2x
    and that of O2 will be x

    Solve for x.

    and one last trivial thing, when you have only one compound/element, don't put 1, it is implied to be 1 when you omit it.
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