To me, it looks like the same thing. Is (HO)2 and H2O2 the same compound? When performing stoichiometric calculations, do they get treated the same?

  • 5
    $\begingroup$ There is no difference, except that nobody writes it as (HO)2. But that's just a matter of convenience. $\endgroup$ Commented Dec 10, 2019 at 22:54
  • $\begingroup$ Relevant $\endgroup$
    – Jan
    Commented Dec 11, 2019 at 6:55

1 Answer 1


(HO)2 is identical to H2O2, except in the cases where ions are formed in water from this substance. For example, if you are using H2O2 as a proton donor, you may consider the following reaction : $$\ce{H2O2->H+ + HO2-}$$ but this reaction could not be obtained and written from the formula (HO)2. So H2O2 is a better choice, and nobody used (HO)2.


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