I converted 2.4 gallons to cc and obtained 9085 cc but you should confirm that.
9085 x 0.787 g/cc = ? grams.
?g/molar mass = moles = x
Energy released is
277.63 kJ/mol x x mol = zz.
For ethanol, C2H5OH, which is mixed with gasoline to make the fuel gasohol, H°f = -277.63 kJ/mol. Based upon data in Table 6.2, and that the density of ethanol is 0.787 g•cm-3, the number of kilojoules released by burning completely 2.40 gallons of ethanol is ?
*Table 6.2 states that the enthalpy of C2H5OH is -277.63
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