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The reaction for the complete combustion of acetylene is shown below.

C2H2(g) + 5/2 O2(g) -----------> 2 CO2(g) + H2O(l) Î”H = -1299 kJ
Use this reaction and the data below to calculate the heat of formation for acetylene.
Î”Hf[H2O(l)] = -285.8 kJ/mol
Î”Hf[CO2(g)] = -393.5 kJ/mol

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