Find the empirical formula from percent composition.
The empirical formula for Formula Mass converts percent composition to moles by dividing each percentage by the element's molar mass, then reduces to a simple ratio. The empirical formula is the smallest whole-number ratio, which is what spectroscopy and combustion data provide.
Formula Mass
Mole ratio = (percent / molar mass) for each element
Mole ratio = (percent / molar mass) for each element The empirical formula for Formula Mass converts percent composition to moles by dividing each percentage by the element's molar mass, then reduces to a simple ratio.
The empirical formula is the smallest whole-number ratio, which is what spectroscopy and combustion data provide.
This calculator takes 3 inputs: Element 1 percent, Element 2 percent, Element 1 molar mass. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.