Ethanol (C2H5OH) and gasoline (assumed to be all octane, C8H18) are both used as automobile fuel. If gasoline is selling for $1.45/gal, what would the price of ethanol have to be in order to provide the same amount of heat per dollar? The density and ΔH°f of octane are 0.7025 g/mL and -249.9 kJ/mol and of ethanol are 0.7894 g/mL and -277.0 kJ/mol, respectively. 1 gal = 3.785 L.
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