Acetylene torches utilize the following reaction:
2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g)
Use the given standard enthalpies of formation to calculate ΔH° for this reaction.

Question

Acetylene torches utilize the following reaction: 2 C₂H₂(g)+ 5 O₂(g)→ 4 CO₂(g)+ 2 H₂O(g) Use the given standard enthalpies of formation to calculate ΔH° for this reaction.

Quizplus · Accepted Answer

ΔH° = Σ(nΔH°f,products) - Σ(mΔH°f,reactants)
ΔH° = [4( -110.5 kJ/mol) + 2(0 kJ/mol)] - [2(25.1 kJ/mol) + 5(0 kJ/mol)]
ΔH° = -2512.4 kJ/mol

Therefore, the correct choice is (D) -2512.4 kJ.

Acetylene Torches Utilize the Following Reaction