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A spherical ball made of naphthalene is placed in a stagnant air at 1 atm. How long will it take for a ball of 3 cm initial diameter to completely sublime at temperature of 100 ¡ÆC? Data at 100 ¡ÆC and 1 atm.: Vapor Pressure of naphthalene = 10 torr; viscosity of air = 0.0215 cP, diffusivity of naphthalene = 0.94 x 10-5m2/s, and density of naphthalene ball = 1140 kg/m3. )