8. A gas-phase reaction is being carried out in a 5-cm-diameter tubular reacter that is 2 m in length. The velocity inside the pipe is 2 cm/s. As a very first approximation, the gas properties can be taken as those of air (kinematic viscosity = 0.01 cm2/s), and the diffusivities of the reacting species are approximately 0.005 cm?/s. a) How many tanks in series would you suggest to model this reactor? b) If the second-order reaction A + B C + D is carried out for the case of equal molar feed and with Cao = 0.01 mol/dm, what conversion can be expected at a temperature for which k= 25 dm/mol.s? c) How would your answers to parts (a) and (b) change if the fluid vekxity were reduced to 0.1 cm/s? Increased to 1 m/s? d) How would your answers to parts (a) and (b) change if the supericial velocity was 4 cm/s through a packed bed of 0.2-cm-diameter spheres? e) How would your answers to parts (a) to (d) change if the fluid were liguid with properties similar to water instead of a gas, and the diffusiiirv was 5 x 10-6 cm/s