Given the following reaction, use Stoichiometry to answer the following questions: 4 Fe (s) + 3 O2 (g) ? 2 Fe2O3 (s) ?H° = -1.65 x 103 kJ 1. When Fe2O3 (rust) is formed, is the reaction exothermic or endothermic? (b) How can you tell from the information provided with the balanced equation? 2. How many mol of O2 are required to form 3.20 mol Fe2O3? 3. How much heat is exchanged when 14.3 kg of iron rusts? 4. How much rust (g) is formed when 200. kJ of heat is released?