A mixture of methane and air is capable of being ignited only if the mole percentage of methane is between 5 and 15 percent. A mixture containing 9.0 mole percentage methane in air flowing at a rate of 700kg/hr is diluted with pure air to reduce the methane concentration to lower flammability limit. Calculate the required flow rate of air in mol/hr and the percentage by mass of oxygen in the product gas

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