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 4.6 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 m^2/s, that the concentrations at the high and low-pressure sides of the plate are 5.2 and 0.32 kg/m^3 (kilogram of hydrogen per cubic meter of palladium), and that steady-state conditions have been attained.