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Answered 2009-11-09 09:30:07

If one of the atoms is already at its smallest amount.

i.e. CH4 would be the same for both,

C2H8 would also have an emperical formula of CH4 though.

H2O --> H2O etc.

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CCl4 is the molecular formula for carbon tetrachloride. It is the same as its empirical formula.

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Yes, it is possible for an empirical formula to be the same as the molecular formula. For example, Lactic acid's molecular formula is C3H6O3, which would make its empirical formula CH2O.

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