# How do you solve chemical formula?

Do you refer to $\text{empirical formula.......?}$
And note that to solve for the empirical formula, the simplest whole number ratio defining constituent atoms in a species, we need first to MEASURE %C, %H, %N by some means. Usually this involves combusting a known mass of compound and shunting the product carbon dioxide and water gases down a gas chromatograph where their proportions are analysed according to a standard.