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Given the reaction , when trying to find standard reaction of entropy, enthalpy, and Gibbs Free Energy, why is used in finding the standard reaction of entropy but not of enthalpy and Gibbs Free Energy? Is it just because it's a gas?
Oxygen is still used in all three formulas. For enthalpy, the formation reaction is the deltaH of the entire reaction. In the textbook, Hrxn is already given of H20, with Oxygen taken in to account. And for Gibbs Free Energy, since the formula is G=H-TS, if entropy and enthalpy use O2, so will Gibbs.
The only reason I can think of is because O2 is already in its most standard state so this would be counted as 0 for those calculations. The textbook goes more into detail on which calculation to use standard state of elements = 0 for.
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