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.
Heating Values of Natural Gas. The heating value of a substance is the energy released upon combustion of a substance at standard conditions. The heating value can be measured as energy released per unit mass, unit volume or unit mole of a substance. For mixtures, the heating value can be estimated as a weighted sum. The following table gives heating values of various hydrocarbons and some other gases in Btu/Scf (energy released per unit volume). BTU : British Thermal Unit for energy. SCF : Standard Cubic Feet of gas. (Standard conditions correspond to 1.013 bara and 200C{adinserter 2}.