Standard enthalpy of formation for an element in its standard state: how does reaction look like?

[m25]

Like, I know that the standard enthalpy of formation for an element in its standard state is always zero. But how exactly does this reaction look like? For example, if we are forming O2(g), then is it simply written like this?

O2(g) --> O2(g) standard enthalpy of formation=0

---

Members don't see this ad.

 

[justadream]

@m25

I don't think there is a reaction for that. Even if there were, I'm not sure why you would need one.