Question: How to derive the equations below ? in each case Diffusion in a plane with a thickness of z2 21 na moles = = DABA

How to derive the equations below ? in each case

Diffusion in a plane with a thickness of z2 21 na moles = = DABA CA1-CAZ 22-21 S CAZ Hollow cylinder of inner radius ry and outer radius rz with diffusion in the radial direction outward Diffusion cross section area is varying DAB(CA1 - CA2) (CA1-CA2) DaBALM In(rz/r1) r2 - r1 Diffusion in spherical shell of inner radius r1 and outer radius r with diffusion in the radial direction outward: 4ntrir2Dab(CA1 - CA2) O = na = 2nL CAZ CA1 AB A r2 - r1 CAZ Should be able to derive the last two equations

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