How much energy (kJ)is released when 15.0g of Fe(l)is produced in the thermite reaction: 2Al(s)+ Fe₂O₃(s)$\rarr$ Al₂O₃(s)+ 2Fe(l)$\Delta$H° = - 822.8 kJ/mol

Question

Quizplus · Accepted Answer

The molar mass of Fe is 55.85 g/mol. For 15.0 g of Fe, the moles of Fe are 15.0 g / 55.85 g/mol = 0.2685 mol. Since the reaction produces 2 moles of Fe, the energy released is (0.2685 mol / 2 mol) * 822.8 kJ = 110.3 kJ, which rounds to 110 kJ.

How Much Energy (KJ)is Released When 15 →\rarr→ Al2O3(s)+ 2Fe(l) Δ\DeltaΔ H° = - 822

How Much Energy (KJ)is Released When 15 $\rarr$ Al₂O₃(s)+ 2Fe(l) $\Delta$ H° = - 822