Question 19 of 20 < > View Policies -/1 !!! Current Attempt in Progress 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 4.8-mm thick sheet of palladium having an area of 0.25 m at 500C. Assume a diffusion coefficient of 6.0 x 10-8 m/s, that the concentrations at the high- and low-pressure sides of the plate are 3.6 and 0.97 kg/m (kilogram of hydrogen per cubic meter of palladium), and that steady-state conditions have been attained. kg/h Question 20 of 20 < View Policies -/1 III Current Attempt in Progress For a steel alloy it has been determined that a carburizing heat treatment of 6-h duration will raise the carbon concentration to 0.38 wt% at a point 1.0 mm from the surface. Estimate the time (in h) necessary to achieve the same concentration at a 6.2 mm position for an identical steel and at the same carburizing temperature. i h