(19) please help me to solve this problem and write the solution step-by-step. Thank you

= 2. Component A diffuses through a stagnant film containing only A and B. Upon reaching the catalytic surface, it is instantaneously converted into species B by the reaction A B. When B diffuses back into the stagnant film, it begins to decompose by the first-order reaction B A. The rate of formation of component A with the film is equal to RA kys, moles A produced/(time)(volume), where ys is the concentration of B expressed in mole fraction. (a) Find the concentration profile of component B in the stagnant film if this is a steady-state process. (10%) (b) Determine the rate at which A enters the (5%) (c) Reconsider the problem and determine the concentration profile of component A in the stagnant film if in the film B decomposes to form A and if A reacts to form B, both by first-order reactions: A V gas film. A1 RA Rb. B B Simultaneously, A is instantaneously reacting to form B in the flat catalytic surface. (10%) A YAO z = 0 BYA A+B 8 FCatalyst