Problem 3. (35 Points) An injectable slow release drug consists of small (1.00 um diameter) spheres containing a pure drug (component A) surrounded by a thin (200 nm) polymer membrane. The mass transfer in the liquid outside the capsules (liquid B) can be assume to behave like mass transfer in a suspension. He = 1.25 CP Pe = 1.12 g/cm Pparticle = 1.05 g/cm Das = 0.735 x 10 cm/s a) Determine the mass transfer coefficient(k) in cm/s outside the spherical capsule. (15 points) lem 3 continued b) The concentration of A in the bulk liquid is negligible. The concentration of A inside the sphere is 0.012500 gmol/cm. The permeance of Ain the membrane is 5.69 x 10 cm/s. Determine the flux of A through the membrane assuming that the resistance to mass transfer inside and outside the capsule is negligible (15 points) c) Is it reasonable to assume that mass transferresistance outside the capsule is negligible in this case? Explain why or why not. (5 points)