Alkanes such as octane, C8H18, can undergo combustion reactions to produce carbon dioxide gas and liquid water

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Alkanes such as octane, C₈H₁₈, can undergo combustion reactions to produce carbon dioxide gas and liquid water. The standard enthalpy of reaction for the combustion of octane is -5,135.1 kJ/mol. If the standard enthalpy of formation, Δ_fH°, for carbon dioxide gas and liquid water are -357.5 kJ/mol and -247.9 kJ/mol respectively, calculate the standard enthalpy of formation (kJ/mol) for octane. Submit your answer with no units and to one decimal place.