Question: how to calculate empirical formula igcse?
Answer: Empirical Formula: Gives the simplest whole number ratio of atoms of each element in the compound.
A compound that contains 10 g of Hydrogen and 80 g of Oxygen has an Empirical Formula of H2O. ... 
Amount of Hydrogen Atoms = Mass in grams ÷ Ar of Hydrogen = (10 ÷ 1) = 10 moles.