Assignment:
Two fuels available for automobile uses are ethanol (C2H5OH) and gasoline (assume it to be octane, C8H18). If gasoline is selling for $2.70/gallon, what would the price of ethanol have to be in order to provide the same amount of heat/dollar? The heat evolved for each fuel can be found by calculating the heat released in the combustion reaction for each fuel. 1 gal = 3.785 L
Octane -249.9 Hf, KJ/mole
Ethanol -277.0 Hf, KJ/mole
Octane 0.7025 density, g/ml
Ethanol 0.7894 density, g/ml