Answer to Question #123776 in General Chemistry for erika janny

Question

If the heat of combustion for the reaction of Octane is -5471kj/mol, how much heat, in kj, is produced when one gallon of octane is burned in excess oxygen if the reaction works perfectly? Please report your answer in six significant figures.

Answer 1

1 gallon = 3.785 l

n = 3.785 / 22.4 = 0.1690 mol

Q = 0.1690 × 5471 = 924.5 kJ

Answer: 924.5 kJ.