TRANSPORT PHENEOMENA QUESTION.

The inner surfaces of two parallel plates given in the figure are covered with Pt-Al2O3 catalyst having thickness porous structure. There is pure A gas between the plates. Gas A diffuses to the catalyst layer and turns into substance B with a reaction rate of rA=k. In steady state, derive a expression that gives the concentration distribution by taking the concentration of gas on the catalyst surface CAo. Derive the expression that gives the molar transport rate (WA: mole A / time) of A on the two surfaces of the plates