Solved: Methane (CH4) gas flows into a combustion chamber

Chapter , Problem 119

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Methane (CH4) gas flows into a combustion chamber at a rateof 200. L/min at 1.50 atm and ambient temperature. Air is addedto the chamber at 1.00 atm and the same temperature, and thegases are ignited.a. To ensure complete combustion of CH4 to CO2(g) and H2O(g),three times as much oxygen as is necessary is reacted. Assumingair is 21 mole percent O2 and 79 mole percent N2,calculate the flow rate of air necessary to deliver the requiredamount of oxygen.b. Under the conditions in part a, combustion of methanewas not complete as a mixture of CO2(g) and CO(g) wasproduced. It was determined that 95.0% of the carbon inthe exhaust gas was present in CO2. The remainder was presentas carbon in CO. Calculate the composition of theexhaust gas in terms of mole fraction of CO, CO2, O2, N2,and H2O. Assume CH4 is completely reacted and N2 isunreacted.