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4. A sphere of naphthalene having a diameter of 20mm is suspended in a large volume of stagnant air at 53C and 1atm. Vapor pressure

4. A sphere of naphthalene having a diameter of 20mm is suspended in a large volume of stagnant air at 53C and 1atm. Vapor pressure of naphthalene at this temperature 1mmHg and diffusion coefficient of naphthalene in air at 0C and 1 atm 5.16106m2/s. Calculate the rate of evaporation of naphthalene from the surface in kgmol/s. develop an expression for the naphthalene concentration in air in terms of r

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