Calculate the rate of diffusion of trichloroacetic acid (Mwt = 163.5 g/gmole) across non- diffusing methanol (Mwt 32 g/gmole) solution of 2 mm thick at 20°C when the %3D concentrations of the acid on the two opposite sides of the methanol film are 6% and 2% by weight of acid. The densities of 6% and 2% acid solutions are 1012 kg/m' and 1003 kg/m' respectively. The diffusivity at infinite dilution of trichloroacetic acid in methanol at 20°C is 1.862x10-9 m²/s.

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