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Std Enthalpy of Formations

Posted: Tue Feb 12, 2019 7:45 pm
by 804994652
Why is it that molecules like O2 and N2 not included when trying to figure out enthalpy of a reaction...?

Re: Std Enthalpy of Formations

Posted: Tue Feb 12, 2019 8:02 pm
by Alexa Tabakian 1A
Their heat of formation is zero because they are in their most stable state, that is why they are not included.