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?
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5There is no difference, except that nobody writes it as (HO)2. But that's just a matter of convenience. – Ivan Neretin Dec 10 '19 at 22:54
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Relevant – Jan Dec 11 '19 at 06:55
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(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.
Maurice
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