A tubular packed bed reactor has developed significant channeling over time. You believe that the\ system can best be modelled using an ideal CSTR in parallel with an ideal PFR.\ a) What are the parameters that you will need to fit for this model? \ b) If a pulse tracer experiment were conducted on the reactor draw predictions for i) the concentration of tracer exiting the reactor, ii) the residence time distribution function, and iii) the cumulative residence time distribution function.