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The reaction quotient can be calculated for partial pressures and concentrations, but when comparing Q to K it is important to compare the reaction quotient for partial pressures to the equilibrium constant to partial pressures, not the equilibrium constant for concentration.
Q is not a fixed ratio like K is. Which means that Q is the ratio of the concentrations and the partial pressures of the products to those of the reactants at that moment in the reaction.It is essentially K but doesn't have to be equal to K. So yes, I think it can be applied to both.
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