Problem: 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 that gasoline consists of a mixture of octanes (different isomers of C8H18), that the average heat of combustion of C8H18(l) is 5400 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, calculate the energy produced by combustion of 3.0 L of gasoline.

FREE Expert Solution

C8H18(l) + O2(g) → CO2(g) + H2O(l)

volume gasoline = 3.0 L

density = 0.70 g/mL

ΔH = - 5400 kJ/mol (heat is released)

molar mass C8H18 = 114.224 g/mol

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Problem Details

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 that gasoline consists of a mixture of octanes (different isomers of C8H18), that the average heat of combustion of C8H18(l) is 5400 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, calculate the energy produced by combustion of 3.0 L of gasoline.