A manufacturing plant located in a narrow canyon has applied to the Environmental Protection Agency (EPA) for a permit to continuously release 15ƒt³/min of exhaust gas, containing 0.06 gmol/ƒt³ of a pollutant, into the air. The wind travels through the canyon at an average flow rate of 800 ƒt³/min (not including the exhaust gas). Furthermore, the pollutant also reacts with the air and sunlight to be converted to a harmless product (the volume of air consumed in this reaction is negligible) so that 20% of the pollutant released is converted by the time it leaves the canyon.
a. What will be the average concentration of the pollutant in the air coming out of the canyon?
b. What wind flow rate entering the canyon would produce a pollutant concentration greater than 0.0025 gmol/ƒt³ in the air coming out of the canyon?