Problem: Ethanol (C2H5OH) is currently blended with gasoline as an automobile fuel.Calculate the heat produced per liter of ethanol by combustion of ethanol under constant pressure. Ethanol has a density of 0.789 g/mL.

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Ethanol (C2H5OH) is currently blended with gasoline as an automobile fuel.

Calculate the heat produced per liter of ethanol by combustion of ethanol under constant pressure. Ethanol has a density of 0.789 g/mL.


C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(l)

ΔH°rxn=ΔH°f, prod-ΔH°f, react

ΔH°rxn=(2 mol CO2)-393.5 kJ1 mol CO2+(3 mol H2O)(-241.8 J1 mol H2O)           -(1 mol C2H5OH)(-234.8 kJ1 mol C2H5OH)+0

ΔH°rxn=-196 kJmol×103 J1 kJ

ΔH˚rxn = –1277.6 kJ/mol


For 1.0 L ethanol:

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Problem Details

Ethanol (C2H5OH) is currently blended with gasoline as an automobile fuel.

Calculate the heat produced per liter of ethanol by combustion of ethanol under constant pressure. Ethanol has a density of 0.789 g/mL.