The isothermal gas phase reaction below is carried out in reactors pure gas a enters the system at a volumetric flow rate of 10 dm'min with the inlet concentration of 4 mol/dm3. the value for k-1 dm'mol. min with e, 4000 cal/mol and kc 1 dm/mol. min with e 12000 cal/mol at 300 k. ) write the rate law for each species in each reaction and then write the net rates of formation of a and b (10 marks) b) sketch the instantaneous selectivity of c to b as a function of the concentration of ca and cb. (10 marks) c) propose the types of reactor or combination of reactors and at what temperatures (qualitatively) would you use for the following reaction system to maximize scb? c is the desired product.