Gasoline (C8H18) and ethanol (C2H5OH) are both used as automobile fuel. If gasoline is selling for $4.50 per gallon, determine the price of ethanol have to be in order to provide the same amount of heat per dollar? The density and delta H degree Fahrenheit 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.