5.8 the purification of hydrogen gas by diffusion through a palladium sheet was discussed in section 5.3. compute the number of kilograms of hydrogen that pass per hour through a 5-mm-thick sheet of palladium having an area of 0.20 m2 at 500c. assume a diffusion coefficient of 1.0  10-8 m2/s, that the concentrations at the high- and low-pressure sides of the plate are 2.4 and 0.6 kg of hydrogen per cubic meter of palladium, and that steady-state conditions have been attained.