7) A slab of cells in a hydrogel slab is covered in a layer of growth medium, 4mm thick (d) and sits in an incubator at 37°C. The gel was chemically cross-linked and still contains a residual dilute...

Extracted text: 7) A slab of cells in a hydrogel slab is covered in a layer of growth medium, 4mm thick (d) and sits in an incubator at 37°C. The gel was chemically cross-linked and still contains a residual dilute amount of non toxic volatile liquid (A), dilute, but enough to maintain a constant supply of A to the quiescent (not moving) layer of medium (B). At the exit of the gel the concentration of A is 0.1 mol/m' and this drops to 0.02 mol/m at the top of the liquid layer, as A diffuses through the medium, to escape into the air 4 mm above. DAB = 7.82 x 10“ cm²/s. a) What is the molar flux of A through the growth medium in mol/m's? b) Determine the concentration profile throughout the growth medium as a function of position z