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Question: A membrane which is permeable to an uncharged molecule X separates two solutions. Solution A contains a 100 mM solution of X and B 10 mM. If the permeability constant for X is 5 cm/s, what is the magnitude and direction of the flux? Give units of flux.

Use Fick's law of diffusion.

How do I know which one is C1 and which one is C2?

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