chemistry

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ethanol(C2H5OH)and gasoline(assumed to be octane,C8H18) are both used as automobile fuel.if gasoline is selling for $2.20/gal,what would the price of ethanol have to be in order to provide the same amount of heat per dollar?The density and ΔHf of octane are 0.7025g/ml and -249.9kJ/mol,respectively and of ethanol are 0.7894g/ml and -277.0 kJ/mol,respectively(1 gal =3.785L)

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