137. Solving a chemistry problem

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Soap forms micelles in water, the radius of which is r = 12.5 nm. Determine the diffusion coefficient of micelles at 313 K if the viscosity of the medium is η = 6.5 ∙ 10-4 Pa ∙ s. Estimate how the diffusion coefficient will change if the water is replaced with a saline solution with a viscosity of 1.046 ∙ 10-3

Pa ∙ s, where micelles have a size of 25 nm.