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Empirical and Molecular Formula

OCR A-level Organic ChemistryFormulaeLesson 5 of 5

The empirical formula shows the simplest whole-number ratio of atoms of each element in a compound. The molecular formula shows the actual number of atoms of each element in one molecule.

For example, ethane has the molecular formula C2H6 and the empirical formula CH3. Butene C4H8 has the empirical formula CH2.

Diagram

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