oxygen has 0 Gibbs free energy of formation






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Hannah Chew 2A
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oxygen has 0 Gibbs free energy of formation

Postby Hannah Chew 2A » Thu Feb 08, 2018 11:37 pm

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)?

Emily Duggan 1F
Posts: 42
Joined: Fri Sep 29, 2017 7:07 am

Re: oxygen has 0 Gibbs free energy of formation

Postby Emily Duggan 1F » Fri Feb 09, 2018 9:43 am

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!

Chris Lamb 1G
Posts: 58
Joined: Fri Jun 23, 2017 11:39 am

Re: oxygen has 0 Gibbs free energy of formation

Postby Chris Lamb 1G » Fri Feb 09, 2018 10:02 am

Unlike energy, entropy can never be zero (unless you are at 0K).


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