The combustion of one mole of octane, C₈H₁₈(l), In a bomb calorimeter released 5460 kJ of heat at 298 K.The products of the reaction are carbon dioxide and liquid water.What is the enthalpy change for this reaction?

Question

Quizplus · Accepted Answer

The enthalpy change for the reaction can be calculated by adjusting the heat released for the difference in the state of water (from liquid in the products to gas, which is the standard state for enthalpy calculations). This adjustment accounts for the enthalpy of vaporization of water, leading to a slightly different value than the heat released, hence the correct answer is -5471 kJ.

The Combustion of One Mole of Octane, C8H18(l), in a Bomb

The Combustion of One Mole of Octane, C₈H₁₈(l), in a Bomb