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A cylindrical piece of naphthalene with a radius of 4mm and a length of 1cm is suspended in a large amount of motionless air at

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A cylindrical piece of naphthalene with a radius of 4mm and a length of 1cm is suspended in a large amount of motionless air at a temperature of 300K and a pressure of 1atm. The surface of the naphthalene cylinder is at a temperature of 300K and its vapor pressure at this temperature is 0.5mmHg. Given that the diffusivity of naphthalene in air at 400K is 6.5106m2/s, what is the rate at which the naphthalene cylinder evaporates from its surface

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