Entalpia Combustão C₈H₁₈

The enthalpy of combustion of octane (C₈H₁₈) is a measure of the energy released when one mole of octane is completely burned under standard conditions. The enthalpy of combustion is an important thermochemical property used to evaluate the energy efficiency of fuels. The formula of octane is C₈H₁₈ and its enthalpy of combustion is approximately -5471 kJ/mol.

The combustion of octane is an exothermic reaction, meaning it releases energy in the form of heat. The enthalpy of combustion is calculated based on the energy required to break the chemical bonds of the reactant molecules and the energy released during the formation of product molecules. The combustion reaction of octane can be represented as: 2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O.

The enthalpy of combustion of octane is useful in various applications, such as in the design of internal combustion engines and in the evaluation of fuel efficiency for vehicles. It is also important information for the petroleum refining industry, as it helps determine the energy value of petroleum-derived fuels.

Care must be taken when working with enthalpy of combustion values, as they can vary slightly depending on experimental conditions and calculation methods. However, the value of -5471 kJ/mol is widely accepted as the standard enthalpy of combustion of octane.