The automobile fuel called E85 consists of 85% ethanol and 15%gasoline. E85 can be used in so-called flex-fuel vehicles (FFVs),which can use gasoline, ethanol, or a mix as fuels. Assume thatgasoline consists of a mixture of octanes (different isomers ofC8H18 ), that the average heat of combustion of C8H18(l)is 5400 kJ/mol , and that gasoline has an average density of 0.70g/mL . The density of ethanol is 0.79 g/mL .
A. How many gallons of E85 would be needed to provide the sameenergy as 40 gal of gasoline?
Express your answer to two significant figures and include theappropriate units.
B.
If gasoline costs $ 3.88 per gallon in the United States, whatis the break-even price per gallon of E85 if the same amount ofenergy is to be delivered?
Express your answer using three significant figures.
