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Air at 45C and 1 atm flows through a cylindrical pipe covered with naphthalene whose internal diameter is 4 cm and length of 60 cm. The superficial velocity of the air is 7.5 m/s. The diffusivity of naphthene in air at 45C is 6.92 x 10^-6 m^2/s and the vapor pressure of solid naphthalene is 0.555 mm Hg. Using the mass transfer coefficient from correlations, determine the sublimation rate of naphthalene from the cylinder in kg/day and the concentration of naphthalene in air leaving the pipe.