Answer the following questions about the reaction above. a) How many moles of O2 need to react in order to form 1.50 mol of Fe2O3 ? b) How many moles of Fe2O3 will form when 1.50 mol of O2 reacts? c) What is the mass of 1.50 mol of Fe2O3 ? d) How many moles of O2 would weigh 75.0 g ?