PLEASE SOLVE BOTH A & B

SUBJECT : CHEMICAL REACTION ENGINEERING
PLEASE SHOW THE FULL METHOD WITH EXPLANATION
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QUESTION 3 In a pilot scale study, the gas phase reaction of AB is carried out in a fixed bed reactor with the diameter of 2 cm. The reaction is catalysed by the spherical catalysts with a particle diameter of 2 mm and the reactants enter the reactor at a volumetric flowrate of 25 cmºs? a. Determine whether internal or/and external diffusions that has limited the reaction b. Determine the catalyst weight and reactor length needed to achieve 90% conversion. Additional information: Effective diffusivity: 9.5 x 104 cmºs? Diffusivity coefficient = 0.035 cm?.s! Kinematic viscosity = 0.04 cm?s-1 Internal surface area of the catalyst = 53 cm?g? Density of the catalyst: 1.35 g.cm3 Bed porosity: 0.35 Specific reaction rate where surface reaction is limiting: 0.09 cm. cmmin-