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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 Vaporization Equation. To calculate the heat necessary to vaporize a substance, the heat of vaporization is used along with the mass of the liquid to be vaporized. Here is the heat of vaporization equation: Q = m Hv. In this equation: 1  Q is the heat or energy required.2  m is the mass. 3  Hv is the heat of vaporization.o calculate the heat necessary to vaporize a substance, the heat of vaporization is used along with the mass of the liquid to be vaporized. Here is the heat of vaporization equation: Q = m Hv. In this equation: 1  Q is the heat or energy required.