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Assuming we are now dealing with steady-state diffusion through the spherical wall shown in the next figure. D = constant. The inner radius is

Assuming we are now dealing with steady-state diffusion through the spherical wall shown in the next figure. D = constant. The inner radius is r, and the outer radius is r. C(r)=C, and C()=C. Also C > C. (i) Please express C(r) analytically with the known parameters. (ii) Please sketch the concentration profile C(r). C f r

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