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An old fashioned glass apothecary jar contains a patent medicine. The neck is closed with a rubber stopper that is 20 mm tall, with a diameter of 10 mm at the bottom end, widening to 20 mm at the top end. The molar concentration of medicine vapor in the stopper is 2 x 10^-3 kmol/m^3 at the bottom surface and is negligible at the top surface. If the mass diffusivity of medicine vapor in rubber is 0.2 x 10^-9 m^2/s, find the rate (kmol/s) at which vapor exits through the stopper.
the table below gives physical properties for three types of fibers used to reinforce polymer resins to make pmc
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