Enter the elements along with their percentages to find the empirical formula. (Instructions)
This program determines both empirical and molecular formulas. To calculate the empirical formula, enter the composition (e.g. C=40%, H=6.67%, O=53.3%) of the compound. Enter an optional molar mass to find the molecular formula.
Read our article on how to determine empirical and molecular formulas.
You can also ask for help in our forums.