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Spherical pellets of 1.0 cm diameter are spray-painted with a very thin coat of paint. The paint contains a volatile solvent. The vapor pressure of the solvent at 298K is 1.17 x 10⁴ Pa, and the diffusivity of the solvent vapor in air at 298 K is 0.0962 cm²/s. The amount of solvent in the wet paint on the pellet is 0.12 g solvent per cm² of pellet is 0.12 g solvent per cm² of pellet surface area. The molecular weight of the solvent is 78 g/gmole. Detemine the minimum time to dry the painted pellet if still air at 298K and 1.0 atm surrounds the pellet.
Sagot :
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