Recall that the * equilibrium constant* is the ratio of the products and reactants.

We use **K**** _{p}** when dealing with pressure and

$\overline{){{\mathbf{K}}}_{{\mathbf{p}}}{\mathbf{}}{\mathbf{=}}\frac{{\mathbf{P}}_{\mathbf{product}}}{{\mathbf{P}}_{\mathbf{reactant}}}}$ $\overline{){{\mathbf{K}}}_{{\mathbf{c}}}{\mathbf{}}{\mathbf{=}}\frac{\left[\mathrm{Product}\right]}{\left[\mathrm{Reactant}\right]}}$

*Note that solid and liquid compounds are ignored in the equilibrium expression.*

Since we’re given the pressure of each compound, we use K_{p}.

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