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A mixture containing 3.3 moles of NO and 0.76 mole ofCO2 was allowed to react in a flask at a certaintemperature according to the equation.

NO (g) + CO2 (g) ↔ NO2 (g) + CO (g)

At equilibrium 0.21 mole of CO2 was present. Calculate the equilibrium constant Kc of this reaction.

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