Answer
See explanation below.
Work Step by Step
Enthalpy of combustion is defined as the amount of heat released when 1 kmol (or 1 kg) of fuel is burned completely at a specified temperature and pressure during a steady-flow combustion process. Whereas enthalpy of reaction is the difference between the enthalpy of the reactants at a specified state and the enthalpy of the products at the same state for a complete reaction.