Assignment:
In a laboratory experiment, air at 347 K and 1 atm is blown at high speed around a single naphthalene (C10H8,) sphere, which sublimates partially. When the experiment begins, the diameter of the sphere is 2.0 cm. At the end of the experiment, 14.32 min later, the diameter of the sphere is 1.85 cm.
(a) Estimate the mass-transfer coefficient, based on the average surface area of the particle, expressing the driving force in terms of partial pressures. The density of solid naphthalene is 1.145 g/cm3 and its vapor pressure at 347 K is 670 Pa (Perry and Chilton, 1973).
(b) Calculate the mass-transfer coefficient for the driving force in terms of molar concentrations.
Provide complete and step by step solution for the question and show calculations and use formulas.