Gasoline, which can be represented by the formula octane, bulk density is 704 g / l. To estimate the variation in enthalpy when burning 28.5 liters

Question

gasoline, based on the binding energies: 0 = 0 (117 kcal); C = 0 (173 kcal); 0 h (111 kcal); C-C (83 kcal); C-H (99 kcal).