The hot exhaust gas from an internal-combustion engine is analyzed and found to have the following percent composition on a volumetric basis at the engine exhaust manifold: 10% CO₂, 2% CO, 13% H₂O, 3% O₂, and 72% N₂. This gas is fed to an exhaust gas reactor and mixed with a certain amount of air to eliminate the CO, as shown in Fig. P13.35. It has been determined that a mole fraction of 10% O₂ in the mixture at state 3 will ensure that no CO remains. What must be the ratio of flows entering the reactor?

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Exhaust gas Exhaust out Reactor Air 3. (2 FIGURE P13.35