Example 17.4 gives the final rate expression for film mass transfer followed by a second-order rate expression for reaction on a plane surface. Please derive this expression and show that it is correct.

Example 17.4

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Dilute A diffuses through a stagnant liquid film onto a plane surface consisting of B, reacts there to produce R which diffuses back into the mainstream. Develop the overall rate expression for the L/S reaction A(1) + B(s)→R(1) which takes place on this flat surface, see Fig. E17.3. Main body of liquid Figure E17.3. CAL Liquid film Ax Solid Plane surface of solid B Equilibrium concentration of A on surface, CA2=0