5.15 (a) Sketch r versus CA - CA for a reversible exothermic reaction if the reactor is operated isothermally at a range of temperatures where the equilibrium conversions go from high to low (b) From Vr plots show how several isothermal PFTRs in series could achieve a higher conversion with a smaller total volume than a single isothermal PFTR. (c) Why is this generally not an economical reactor design