The Highly Exothermic Thermite Reaction, in Which Aluminum Reduces Iron(III)

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) + Fe₂O₃(s) → 2Fe(s) + Al₂O₃(s) ΔH°_rxn= -847.6 kJ/mol
What mass of iron is formed if 725 kJ of heat are released?

A) 23.9 g
B) 47.8 g
C) 65.3 g
D) 95.5 g
E) 112 g

Correct Answer:

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