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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.
Î³ = C P C V = c P c V {\displaystyle \gamma ={\frac {C_{P}}{C_{V}}}={\frac {c_{P}}{c_{V}}}}. where C is the heat capacity and c the specific heat capacity (heat capacity per unit mass) of a gas. The suffixes P and V refer to constant pressure and constant volume conditions, respectively.