Ethanol, C₂H₅OH, is being promoted as a clean fuel and is used as an additive in many gasoline mixtures. Calculate the ΔH°_rxnfor the combustion of ethanol. (ΔH°_f [C₂H₅OH(l)] = −277.7 kJ/mol; ΔH°_f [CO₂(g)] = −393.5 kJ/mol; ΔH°_f [H₂O(g)] = −241.8 kJ/mol)

Question

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The balanced combustion reaction for ethanol (C2H5OH) is: C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g). Using the given ΔH°f values, ΔH°rxn = [2(-393.5) + 3(-241.8)] - [-277.7] = -1234.7 kJ.

Ethanol, C2H5OH, Is Being Promoted as a Clean Fuel and Is

Ethanol, C₂H₅OH, Is Being Promoted as a Clean Fuel and Is