Iron pyrite (FeS2) is the form in which much of the sulfur exists in coal. In the combustion ofcoal, oxygen reacts with iron pyrite to produceiron(III) oxide and sulfur dioxide, which is amajor source of air pollution and a substantialcontributor to acid rain.What mass of Fe2O3 is produced from 85 L of oxygen at 3.73 atm and 143 C with an excess of iron pyrite?