The hydrogen gas can be purified by diffusion through a palladium sheet. Compute the weight of hydrogen that pass through a 6-mm thick sheet of palladium having an area of 0.25 m2 at 600 oC in an hour. Assume a diffusion coefficient of 1.7 x 10-8 m2/s, that the respective hydrogen concentrations at the high- and low-pressure sides of the plate are 2.0 and 0.4 kg/m3, and that steady-state conditions have been attained.