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4. Variable Volumetric Flowrates in PFR. The reaction AB+C+2D is taking place in the gas phase in an ideal, isothermal PFR at constant total pressure. The reaction temperature and pressure are 400K and 1atm, respectively. At these conditions, the gas mixture obeys the ideal gas law. The rate equation is rA=1+KACAkCA The volume of the reactor is 1000L, and the molar flowrate of A is 500mol/h. The mole fraction of A in the feed stream is 0.50. At 400K,k=45h1 and KA=50L/molA. What is the fractional conversion of A in the stream leaving the PFR