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 (in kg/h) through a 4.3-mm thick sheet of palladium having an area of 0.25 m2 at 500�c. assume a diffusion coefficient of 6.0 x 10-8 m2/s, that the concentrations at the high- and low-pressure sides of the plate are 5.7 and 0.30 kg of hydrogen per cubic meter of palladium, and that steady-state conditions have been attained. find in kg/h