Chemistry / Unit 2 Chem 0258 short lesson, about 20 seconds
Empirical Formula
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The idea
An empirical formula reports atom counts reduced to lowest terms, so any factor shared across the molecular subscripts is divided out.
In practice
Benzene's molecular formula, C6H6, reduces to the empirical formula CH once the shared factor of six is divided out of both subscripts.
Where people slip
An empirical formula and a molecular formula can look identical while describing very different-sized molecules that share one ratio.
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