The empirical formula shows the smallest integer numbers of the atoms of the elements that make up a substance. Therefore, we need to find the number that is divisible by the index of each element of the molecular formula.
The molecular formula is C6H12O6 We can divide each index by 6:
6/6 = 1
12/6 = 2
6/6 = 1
So the empirical formula is CH2O.
Answer: C1H2O1