A long cylinder of a polymer (diameter of 2cm ) is exposed to a humid environment that establishes a concentration of 5104 moles H2Ocm3 at the surface of the polymer. Initially the polymer contains no absorbed H2O. (a) Calculate the average concentration of H2O after 19.5 hrs. exposure to the humid environment. (b) Calculate the concentration of H2O in the center after 19.5hrs. exposure to the humid environment. Data: The diffusion coefficient of the absorbed H2O in the polymer is 109m2s1