This is for transport processes homework. I really appreciate your help!

Problem 3. (5 pts each for parts ' a ' and ' b '). Textbook problem 6.9. ** For part (a), assume that the effective partition coefficient for this 2-layer membrane is equal to 1.0. ** Replacement for part (b): Instead of answering the book's part (b), which is rather vague, determine the thickness of layer 2 that would give the same diffusional resistance as layer 1 , and then calculate the effective diffusion coefficient for this type of 2-layer membrane, again assuming the effective partition coefficient for this 2-layer membrane is equal to 1.0 . 6.9 Consider a rectangular laminate consisting of two layers, as shown in Figure 6.9. Assume that 1=2=1 (a) For the following values, determine the effective diffusion coefficient: Di,1=5106cm2s1Di,2=7107cm2s1L1=20mL2=80m (b) Determine conditions for which the two-layer model behaves as an effective one-layer model. FIGURE 6.31 Diffusion through two media arranged in parallel