The highly exothermic thermite reaction, in which aluminum reduces iron(III) oxide to elemental iron, has been used by railroad repair crews to weld rails together. 2Al(s) + FeO3(s) 2Fe(s) + Al2O3(s) AHD = -847.6 kJ/mol rxn What mass of iron (55.85 g/mol) is formed if 725 kJ of heat are released? 112 g 23.9 g 65.3 g 47.8 g 95.5 g