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The system CO2(g) + H2(g) ⇌ H2O(g) + CO(g) is at equilibrium at some temperature. At equilibrium, 4.00L vessel contains 1.00 mole CO2, 1.00 mole H2, 2.40 moles H2O, and 2.40 moles CO. How many moles of CO2 must be added to this system to bring the equilibrium CO concentration to 0.669 mol/L? a) 0.498 moles b) 0.429 moles c) 0.993 moles d) 0.069 moles