A disk of radioactively tagged benzoic acid 1 cm in diameter is immersed in 94 cm3 of initially pure water. We find that the solution contains benzoic acid at 7.3x10-4 g/cm3 after 10 hours 4 minutes and 3.43x10-3 g/cm3 after a long time (i.e., at saturation). (a) What is the mass transfer coefficient
