Corrosion inside a closed container can result in an oxygen-deficient atmosphere within the container. the typical corrosion rate for carbon steel in very moist air is about 0.127 mm/yr and is approximately first-order with respect to the oxygen concentration. assuming that the corrosion reaction can be approximated by the reaction 3 2fe o2 fe2o3 determine the exposure time required to reduce the oxygen content in a closed 7.6-m-diameter spherical container from 21 to 19.5 mol %