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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.
Unit for heat is J (joules), specific heat is J/g Â°C. NOTE: use must use the specific heat that applies to the physical state of the substance. Specific heat for steam (water vapor) 2.02 J/g Â°C Specific heat for liquid water 4.184 J/g Â°C Specific heat for ice is 2.06 J/g Â°C.nit for heat is J (joules), specific heat is J/g Â°C. NOTE: use must use the specific heat that applies to the physical state of the substance. Specific heat for steam (water vapor) 2.02 J/g Â°C Specific heat for liquid water 4.184 J/g Â°C Specific heat for ice is 2.06 J/g Â°C.