Ethanol, C₂H₅OH, is being promoted as a clean fuel and is used as an additive in many gasoline mixtures. Calculate the $\Delta$H$\degree$_rxn for the combustion of ethanol. ($\Delta$H$\degree$_f [C₂H₅OH(l)] = -277.7 kJ/mol; $\Delta$H$\degree$_f [CO₂(g)] = -393.5 kJ/mol; $\Delta$H$\degree$_f [H₂O(g)] = -241.8 kJ/mol)

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The balanced equation for the combustion of ethanol is: C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g). Using the formula ΔH°rxn = ΣΔH°f(products) - ΣΔH°f(reactants), we calculate: 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