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4) Nutrient diffusion into tissue ( 9 pts) Consider a homogeneous slab of tissue of thickness L that is able to consume nutrient A that diffuses into it with a first-order reaction with molar rate RA=k1CA. (b) Now consider as the starting point that the slab initially (at time 0 ) has a uniform concentration CAO and that the surroundings have zero concentration with the above first order reaction occurring. Derive an infinite series expression for the time-dependent concentration profile in the slab