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Why does oxygen (and other naturally occurring elements like I2, H2, K) all have 0 Gibbs free energy, even though there is some numerical value for molar entropy still listed in the Appendix? Doesn't delta G formation = delta H formation - T (delta molar entropy)?
Yes, and the enthalpy of formation of elements in their standard state, like H2, O2 and I2, are all 0. So when you calculate delta G formation, the numerator is 0 so the delta G is 0. Hope this helps!
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