(Chemical Connections 2B) Ethanol is added to gasoline to produce E-15 and E-85. It prom...

(Chemical Connections 2B) Ethanol is added to gasoline to produce E-15 and E-85. It promotes more complete combustion of the gasoline and is an octane booster. Compare the heats of combustion of 2,2,4-trimethylpentane (1304 kcal/mol) and ethanol (327 kcal/mol). Which has the higher heat of combustion in kcal/mol? In kcal/g?