The irreversible gas-phase reaction AB is carried out in an isobaric PBR packed with catalyst particles. The reaction is first order in the concentration of A on the catalyst surface: rAS=kCAS The feed consists of 50mol%A and 50mol% inert and enters the reactor at a temperature of 300K. The entering volumetric flow rate is 10L/s. The relationship between the Sherwood number and the Reynolds number is: Sh=100Re1/2 The entering concentration of A is 1.0M. Assume that the reaction is external mass transfer limited. a. If the reactor is operating isothermally, what is the catalyst weight necessary for 60% conversion of A ? [900 kg] b. If the reaction is operating adiabatically, what is the catalyst weight necessary for 60% conversion of A ? [500 kg] Additional information: Kinematic viscosity: 0.02cm2/s Particle diameter: 0.1cm Superficial velocity: 10cm/s Catalyst surface area/mass of catalyst bed: 60cm2/g cat Diffusivity of A: 0.01cm2/s Heat of reaction: 10000cal/molA Heat capacity of A: 25cal/(molK) Heat capacity of B: 25cal/(molK) Heat capacity of inerts: 75cal/(molK) k at 300K=0.01cm3/(g cat "s) E=4000cal/mol