The purification of hydrogen gas is possible by diffusion through a thin palladium sheet. Calculate the number of kilograms of hydrogen that pass per hour through a 5.5-mm-thick sheet of palladium having an area of 0.84 m2 at 500°C. Assume a diffusion coefficient of 8.2 X 10-8 m2/s that the concentrations at the high- and low-pressure sides of the plates are 3.2 and 0.37 kg of hydrogen per cubic meter of palladium, and that steady-state conditions have been attained.