chemical engineering kinetics reaction

The gas phase multiple reactions 2A → B rA=-k1CA2 B → C rC=k2CB are to carried out in a flow reactor. The feed to be processed is 50 mol % A and the rest inerts. The inert flow rate is 2 lbmols/min. The reactor is to be operated isothermally at 200 oF and 1 atm pressure. The concentration of B in the effluent stream is to be maximized. (a) What is the CSTR volume (ft3) required and the corresponding maximum concentration of B, CB (lbmol/ft3) in the effluent? (b) What is the PFR volume (ft3) required and the corresponding maximum concentration of B, CB (lbmol/ft3) in the effluent? Data: MA=48 lb/lbmol; MB=96 lb/lbmol; MC=96 lb/lbmol; MI=28 lb/lbmol k1=1200 ft3/lbmol A min k2=2.00 min-1