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Assume that a substance is going through diffusion in a long cylindrical tube with radius 2.0mm. What is the diffusion coefficient if the substance is

Assume that a substance is going through diffusion in a long cylindrical tube with radius 2.0mm.

What is the diffusion coefficient if the substance is moving at 0.025*10^-9 mol per second at plane of concentration gradient 5.0M/m?

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