Molecular compoun: C6H9O4
Each number to the right to the symbol of an atom is a subscript and represents the number of atoms of that element that is in the formula.
The empirical formula is the most reduced formula that shows the right ratio of all the atoms with whole numbers.
The you have to find is there is a set of numbers that have the same ratios: 6:9:4 but has lower whole numbers.
That is only possible if the three numbers ha a common divisor, which is not the case. This is, there is not a whole number that is a divisor of 6, 9 and 4, and that means that the empirical formula is the same formula shown C6H9O4.
Answer: the empirical formula is C6H9O4.
