Problem 7-21 (Level 2) The irreversible, first-order, liquid- phase reactions ARS are currently carried out in two ideal CSTRs in series. The desired product is R. Two streams are fed to the first reactor. One is a solution of A at a volumetric flow rate of 100 gal/min. The concentration of A in this stream is 0.75 lb-mol/gal. The second stream is pure solvent at a flow rate of 200 gal/min. There is no R or S in either stream. Both reactors operate at 200C; at this temperature k = kz = 0.25 min-1. The volume of the first reactor is 150 gal and the volume of the second reactor is 1000 gal. 1. What are the concentrations of A, R, and S in the effluent from the first reactor? 2. What are the concentrations of A, R, and in the effluent from the second reactor? 3. Would the concentration of R in the effluent from the second reactor increase, decrease or stay the same if the order of the two reactors was switched (large reactor first, small reactor last), with all other conditions remaining the same? 4. The second reactor in the original configuration is to be replaced by an ideal plug-flow reactor operating isothermally at 200 C. What should the volume of this reactor be in order to maximize the production rate of R, i.e., the concentration of R in the effluent from the plug-flow reactor? How much will the production rate of R increase relative to the original configuration