The current one on chegg isn't correct. please fix.

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