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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.
Iso Pentane nâ Pentane DME 152a 134a Net Heat of Combustion of Liquid at 77 Â°F (BTU/lb) 19,657 19,589 19,918 19,304 19,495 12,397 4,937 0 Chemical Heat of Combustion (kJ/g) 43.3 42.8 44 41.9 42.5 26.5 6.3 0 Viscosity of Liq., centipoise @ 100 Â°F 0.14 0.131 0.084 0.191 0.196 0.115 0.141 0.166 Coefficient of Liquid