Ne practical example of steady-state diffusion is found in the purification of hydrogen gas. one side of a thin sheet of palladium metal is exposed to the impure gas composed of hydrogen and other gaseous species such as nitrogen, oxygen, and water vapor. the hydrogen selectively diffuses through the sheet to the opposite side, which is maintained at a constant and lower hydrogen pressure. under steady-state conditions and at 600°c, a diffusion coefficient for hydrogen in palladium is d = 1.7 × 10-8 m2 /s. the respective hydrogen concentrations at the high- and low-pressure sides of the palladium plate are 2.0 kg/m3 and 0.4 kg/m3 , respectively. compute the number of kilograms of hydrogen that pa