need answers ASAP

4. (20 pts) The catalytic reaction A 4R is run in a packed bed reactor with Cao = 1 mol/li, FAO = 2000 mol A/h and conversion is 35%. During the course of reaction the concentration of A at various times were measured and the rates (mol/g cat h) of reaction were determined accordingly. A plot of 1/- A versus X resulted in a curve that can be represented mathematically as: 1/-TA = 0.0985 + 0.3615 + 1.191112 a. What is the weight of catalyst needed? b. If the reaction takes place in a backmix reactor, what is the weight of catalyst needed