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QUESTION

# What is the empirical formula of H2O2?

The empirical formula for the molecular formula "H"_2"O"_2" is "HO".

The empirical formula of a compound is the lowest whole number ratio of in the compound. This ratio becomes the subscripts for the empirical formula.

The molecular formula "H"_2"O"_2" is a multiple of the empirical formula. We can know this because the ratio of "2H":2"O" is not the lowest whole number ratio. By dividing the subscripts by 2, we can determine the lowest whole number ratio, which is "1H":1"O". Therefore, the empirical formula for "H"_2"O"_2" is "HO".

Sometimes the molecular and empirical formulas are the same.