Divide the number of moles of each element by the smallest number of moles. An example of how to use the empirical rule. Our molecule contains 4000 carbon 672 hydrogen and 5328 oxygen.
Next determine the empirical rule values.
This combustion analysis calculator considers the symbol percentage mass of the element determine the simplest whole-number ratio of atoms in a compound. For example 135 g Ca 401 gmol Ca 0337 mol Ca 108 g O 160 gmol O 0675 mol O and 0675 g H 101 gmol H 0668 mol H. M - s 100 15 85. The first step in determining the molecular formula of a compound is to calculate the empirical mass from its empirical formula.