The standard enthalpy change of combustion of hexane is greater than the experimental value because the combustion of hydrocarbons is not always complete.
The term standard enthalpy of combustion is used to described the heat evolved upon burning one mole of a substance in oxygen under standard conditions.
We must recall that the combustion of hydrocarbons is not always complete as such, the standard enthalpy change of combustion of hexane is greater than the experimental value.
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