heat of formation at standard state Q

[Smooth Operater]

According to kaplan, change of enthalpy of “an element” in its standard state is zero.

Does "change of enthalpy" of an element mean the same as "heat of formation" of an element?

and how come the heat of formation of O2 molecules is 0 according to kaplan? O2 molecules is not an element Any chem expert can explain this? Thanks

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[CJ122638]

Heat of formation of O2 will be zero, just like heat of formation of F2, or Cl2, or whatever else.

 

[djeffreyt]

an element in it's standard state does not mean the same thing as a single atom...some elements at standard conditions like H, Cl, and F, are diatomic molecules in their standard form (lowest energy form) ...H2, Cl2, F2

there are others like some metals that are single elements in their standard state.