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The equilibrium constant (Kc) for this reaction is 5.0 at a given temperature.
CO(g) + H2O(g) ⇌ CO2(g) + H2(g)
(a) On analysis, an equilibrium mixture of the substances present at the given temperature was found to contain 0.20 mol of CO, 0.30 mol of water vapor, and 0.90 mol of H2 in a liter. How many moles of CO2 were there in the equilibrium mixture?