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.
In the absence of published data the heat of combustion (LHV) can be experimentally determined using the following procedure: 1  Measure a known quantity of water into a flask and stand this on top of a tripod situated above a fuel source.