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Enthalpy of formation

Posted: Tue Feb 12, 2019 5:14 pm
by Adrienne_4F
What other molecules besides O2 and N2 have o enthalpy of formation?

Re: Enthalpy of formation

Posted: Tue Feb 12, 2019 5:33 pm
by Emmaraf 1K
Any element in its most stable state has an enthalpy of formation of 0. If you look at a periodic table which has states of matter labelled, the element in that state of matter has an enthalpy of formation of 0 except for diatomics which must have 2 atoms present at their most stable state of matter to be in their most stable state.

Re: Enthalpy of formation

Posted: Sat Feb 16, 2019 8:36 pm
by Henry Dudley 1G
Just to add to the previous response, only elements, compounds, molecules, etc. that are not in their most stable states have enthalpies of formation that are not 0.