Empirical Formula: The simplest whole number ratio of atoms of each element present in a compound.
EG A chloride of Iron contains 65.5% chlorine. What is the empirical formula?
element present: Iron Chlorine
% by Mass (g): 34.5 65.5
Relative atomic mass (Ar): 55.8 35.5
Moles (mass/M): 34.5/55.8= 0.618 65.5/35.5= 1.845
Ratio (moles/0.618) 1 : 3
Empirical Formula = FeCl3
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