Hydrogen gas at 2.0 atm and 27C is flowing in a neoprene tube 3.0 mm inside diameter and 11 mm outside diameter. DAB = 0.18010-9 m2/s, S = 0.053 m3 gas (STP)/m3 solid atm a) Derive an equation for concentration distribution. b) Calculate the leakage of H2 through a tube 1.0 m long in kg mol H2/s at steady state