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Calculating the equilibrium constant


An 8.0 mol sample of X(g) and an 8.0mol sample of Q(g) are combined in a rigid, evacuated 1.0 L container at a particular temperature, and the reaction represented above occurs. When the mixture reaches equilibrium, 4.0 mol of R(g) is present in the container.
What is the value of the equilibrium constant, Kc, for the reaction at this temperature?
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