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You calculate Q the same way as you'd calculate K, using the gases and aqueous substances involved in the reaction. The only difference between Q and K is that Q can be different values since it can be calculated at any point during the reaction, while the K for a reaction at a specific temperature/pressure is always constant since it is the value of the ratio of concentrations/partial pressures of products to reactants at equilibrium.
When you calculate Q, you use the exact same process as if you were calculating for K. This means that you include all aqueous solutions and gases. Do not include solids or liquids in your calculations for Q (or K for that matter).
We calculate Q the same way we calculate K, and we account for both aqueous and gaseous states. However, liquids and solids are disregarded when calculating the constants. The only difference is that Q indicates the change in the reaction/system at any time before reaching equilibrium, but K is at equilibrium.
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