Question: We consider a spherical particle with a radius R which can dissolves only by diffusion. We assume that the concentration at the surface is er

We consider a spherical particle with a radius R which can dissolves only by diffusion. We assume that the concentration at the surface is er and when the distance from the center goes to infinity the concentration approaches zero and we can note it by Co. If D is the diffusion coefficient shows that: CE R Co + - c is the concentration at any distance r greater than R

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