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Question: mixtures of methane and air are capable of being ignited...

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Mixtures of methane and air are capable of being ignited only if the mole percent of methane is between 5 mol% and 15 mol%. A mixture contains 7.5 mol% methane in air and is flowing at a rate of 850 kg/h. It is to be mixed with a fresh air feed to lower its methane concentration below the flammability limit of 5 mol%. a) Draw a flowchart (diagram) of the process. b) Calculate the minimum flow rate of air required (in kg/h). c) Calculate the percent (by mass) of oxygen in the product gas. Note: Air may be taken to consist of 21 mol% O2 and 79 mol% N2 and to have an average molecular weight of 29.0 g/mol.Mixtures of methane and air are capable of being ignited only if the mole percent of methane is between 5 mol% and 15 mol%. A mixture contains 7.5 mol% methane in air and is flowing at a rate of 850 kg/h. It is to be mixed with a fresh air feed to lower its methane concentration below the flammability limit of 5 mol% a) Draw a flowchart (diagram) of the process. b) Calculate the minimum flow rate of air required (in kg/h). c) Calculate the percent (by mass) of oxygen in the product gas. Note: Air may be taken to consist of 21 mol% ) and 79 mol% N2 and to have an average molecular weight of 29.0 g/mol.

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