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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.
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