The thermite reaction, in which powdered aluminum reacts with iron oxide, is highly exothermic: 2al (s) + fe2o3 (s) →al2o3 (s) + 2fe (s) use standard enthalpies of formation to find δh∘rxn for the thermite reaction. express the heat of the reaction in kilojoules to four significant figures.

Question

Chemistry

Valentin Benton

6 July, 06:36

The thermite reaction, in which powdered aluminum reacts with iron oxide, is highly exothermic: 2al (s) + fe2o3 (s) →al2o3 (s) + 2fe (s) use standard enthalpies of formation to find δh∘rxn for the thermite reaction. express the heat of the reaction in kilojoules to four significant figures.

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Marina Cowan · Answer 1

Answer is: heat of the reaction is - 851,500 kJ.

Chemical reaction: 2Al + Fe₂O₃ → Al₂O₃ + 2Fe.

ΔHf (Fe₂O₃) = - 824,2 kJ/mol; enthalpy of formation.

ΔHf (Al₂O₃) = - 1675,7 kJ/mol.

By definition ΔH (element) = 0 kJ/mol.

ΔHrxn = ∑ΔH (products) - ∑ΔH (reactants).

ΔHrxn = 1 mol · (-1675,7 kJ/mol) - 1 mol · (-824,2 kJ/mol).

ΔHrxn = - 851,500 kJ.