= - ∆H°rxn Σ∆H°(products) Σ∆H°(reactants) kJ = [(2 moles CO2 (g))( kJ/mol) + (1 mol H2O (l))( kJ/mol)] [(1 mol C2H2 (g))(Δ) –1299 –393 –286 – = 227 kJ/mol Δ
∆H°rxn = Σ∆H°(products) - Σ∆H°(reactants) –1299 kJ = [(2 moles CO2 (g))( –393 kJ/mol) + (1 mol H2O (l))( –286 kJ/mol)] – [(1 mol C2H2 (g))(Δ) Δ = 227 kJ/mol
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