a 4-cm diameter, 0.5-mm thick spherical container made of BCC iron holds nitrogen at 700C. The concentration at the inner surface is 0.05 atomic percent and at the outer surface is 0.002 atomic percent. Calculate the number of grams of nitrogen that are lost from the container per hour. N in BCC iron. Do = 0.0047 cm^2/s and Q = 18.300 cal/mol