The diffusion constant for the alcohol ethanol in water is, Physics

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The diffusion constant for the alcohol ethanol in water is

The diffusion constant for the alcohol ethanol in water is 1.24 10-9 m2/s. A cylinder has a cross-sectional area of 3.85 cm2 and a length of 1.82 cm. A difference in ethanol concentration of 1.42 kg/m3 is maintained between the ends of the cylinder. In one hour, what mass of ethanol diffuses through the cylinder?

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