A mixture of 70 mole% propane and 30 mole% hydrogen is burned with 30% excess air. Fractional conversions of 90% of the propane and 85% of the hydrogen are achieved; of the propane that reacts, 90% reacts to form CO2 and the balance reacts to form CO. The hot combustion product gas passes through a boiler in which heat transferred from the gas converts boiler feedwater into steam.
(A) Calculate the concentration of CO (ppm) in the stack gas.