Table 1: Diffusivities and permeabilities in solids. Solute Solid DAS Diffusion Coefficient (nr?) Solubility, me solute(STP) me' solid-atm Permeability, P me' solute(STP) matem (A) T(K) H Vulcanized rubber 298 0.85(109) 0.040 0.342(10-19) 02 N CO H 298 298 0.21(10) 0.15(10-9 0.11(10) 0.070 0.035 0.90 0.152(10-1) 0.054(10-0) 1.01(10-10) 298 Vulcanized neoprene 290 0.051 0.053 Polyethylene 0.103(10-9 3000.180(10-9 298 303 303 H O2 N2 02 N2 Air 6.53(10-2) 4.17(10-2) 1.52(10-2) 0.029(10-2) 0.0152(10-2) Nylon 303 303 298 HO HO He English leather Wax Cellophane Pyrex glass 306 311 293 0.15-0.68 x 10 0.16(10-1) 0.91 -1.82(109) 4.86(10-15) 20.1(10-15) 373 293 He 0.01 H SiO2 Fe Cu 293 293 2.4-5.5(10-14) 2.59(10-13) 1.3(10-4) Hydrogen diffuses through a polyethylene membrane at 25 C. The pressures on the sides of the membrane are 6 MPa and 350 kPa. Diffusivity and permeability data are given in Table 1. If the hydrogen flux is to be 0.34 kg mol/m.h, determine the thickness of the membrane in um. (6 marks)