Problem 2. (30 points) A delayed release drug consists of a pharmaceutical molecule (A) that is contained inside a spherical polymer shell (B). The drug must diffuse through the shell before it can be delivered into the surrounding environment. The concentration of the drug is Car = 0.235 mol/m'at the inner surface of the shell and is negligible at the outer surface. The diffusivity of drug (A) in polymer (B) is Das = 1.46 x 10-12 m/s. Determine the total molar rate of A being released from the capsule (NA) in gmol/s as well as the flux of A at the outer surface in gmol/(s m). 11 = 0.03 mm; 12 = 0.05 mm