Which pair of molecules has the same empirical formula?

Solution: To find empirical formula, we divide all of the subscripts in a molecule by a number until we can not divide anymore.

C2H4O2: all the subscripts can be divided by 2 to give C1H2O1

C8H16O8: all the subscripts can be divided by 8 to give C1H2O1

This pair has the same empirical formula.

NaCrO4 can not be divided any further and is the empirical formula already

Na2Cr2O7 can not be divided any further and is the empirical formula already

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