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The automobile fuel called E80 consists of 80% ethanol (C2H5OH) and 20% gasoline. E80 can be used in the so-called flex-fuel vehicles (FFVs), which can use gasoline, ethanol, or a mix as fuels. Assume that gasoline consists of a mixture of octanes (different isomers of C8H18), that the average heat of combustion of C8H18(l) is 6700 kJ/mol, and that gasoline has an average density of 0.70 g/mL. The density of ethanol is 0.79 g/mL. By using the information given as well as data from the thermodynamic quantities table, a. Compare the energy produced by combustion of 1.0 L of gasoline and of 1.0 L of ethanol. b. Assume that the density and heat of combustion of E80 can be obtained by using 80% of the values for ethanol and 20% of the values for gasoline. How much energy could be released by the combustion of 1.0 L of E80?
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