15- Propane gas flows into a combustion chamber at a rate 250 L/min at 2.0 atmand...

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15- Propane gas flows into a combustion chamber at a rate 250L/min at 2.0 atmand ambient temperature. Air is added to thechamber at 1.0 atm and the same temperature. The gases areignited.
a) To get complete combustion of the propane to carbon dioxideand water three times as much oxygen as is stoichiometricallyappropriate is required. Assuming air is 21% oxygen and 79%nitrogen, calculate the required flow rate of air?
b )Under the conditions in part a, the combustion is notcomplete and a mixture of carbon dioxide and carbon monoxide isproduced. It is determined that 94.0% of the carbon in the exhaustgas is present as carbon dioxide. The remainder is carbon monoxide.Calculate the percent composition of the exhaust gas in terms ofmole fraction of CO, CO2 , O2 , N2 , and H2O. Assume the propane iscompletely reacted and the nitrogen is totally unreacted.
Can you please explain part B? I got 476.190 mL/min for partA.

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3.9 Ratings (606 Votes)

a Flow rate of propane gas is 250 Lmin at 20 atmassuming 1 min flow we have 250 L of propanewe have from PVnRT2 atm x 250 L n x 0082057 L atm K1mol1 x 298 Kn 20447 molesas per the stoichiometry of combustion propane we have theequationC3H8 5O23CO2 4H2OAs per stoichiometry 1 mole propane requires 5 moles of oxygenit says in the problem thatTo get complete combustion of the propane to carbon dioxide andwater three times as much oxygen as is stoichiometricallyappropriate is See Answer

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