The enthalpy change in the combustion of the hydrocarbon octane is delta H = -5.48 x 10^3 kJ/mol C8H18 (l). How much heat, in kilojoules, is liberated per gallon of octane burned? (Density of octane = 0.703 g/mL; 1 gal = 3.785 L.)

Answer 1

Convert 1 gallon to liters to mL, then use density to convert to grams and divide by molar mass to convert to moles.
Then moles x 5.48E3 kJ/mol = ??

Answer 2

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Answer 3

-128000

Answer 4

-126741.286

Answer 5

-1.28x10^5 kJ