Imagine being able to use your computer to make phone calls with the help of special software and a microphoneâand bypassing your phone company and their charges.
So O2 has zero of heat of formation (or enthalpy of formation). The enthalpy of a reaction is defined like this: H = Hproducts-H reactants. The enthalpy of reaction in this case, is the same as the heat of combustion. Hproducts is obtained summing the heats of formation.
Heat of Combustion and Heating Value The heat of combustion, or enthalpy of combustion, of a fuel is defined as the energytransferred during a steady-flow process in which the fuel is completely burned andwhere the products are returned to the temperature and pressure of the reactants.