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Solids and liquids are not used in calculating an equilibrium constant, only gasses and aqueous solutions are considered. This is because the activity of the pure solids and liquids are considered to be 1, so it would not affect the equilibrium equation (their concentrations do not change throughout the experiment).
K is calculated with the concentration of the products over the concentration of the reactants at equilibrium. Since solids and liquids in a reaction do not change concentrations, they would just cancel out when calculating the equilibrium constant. So, only gases are considered when calculating K.
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