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Calculate the rate of diffusion of sodium chloride at 298 K through a stationary film of water 1 mm thick where the concentrations are 20 weight % and 8 weight % respectively on either side of the film. The diffusivity of sodium chloride in water is 1.35 X 10-9 m 2 /s. Densities of 20 % and 8 % NaCl solutions are 1145.3 kg/m3 and 1054 kg/m3 respectively.
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