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A container initially has 0.0186 M ammonia at a certain temperature. When the system reaches equilibrium the concentration of ammonia is 0.0035 M. Calculate Kc for the following reaction as written.

N2(g) + 3H2(g) --> 2NH3(g)

  • Chemistry -

    Write the Kc expression from the equation..
    N2 + H2 ==> 2NH3
    Then 0.0186 M NH3 initially.
    At equilibrium H2 must be 3x, N2 must be 2x, and NH3 must be 0.0186-2x. Plug those values in and solve for Kc.

  • Chemistry -

    Thanks, that's what I got :)

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