It's the simplest ratio of the atoms or ions in a compound.
Empirical formula for an 80% carbon hydrocarbon
Carbon
Hydrogen
Mass in 100g
80
20
Ratio of atoms/ moles (mass/Ar)
80/12=6.67
20/1=20
Simplest ratio of atoms (divide by smallest)
6.67/6.67=1
20/6.67=3
Empirical Formula
CH3
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