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Types of Formulae

Edexcel AS-level ChemistryIntroduction to Organic ChemistryLesson 4 of 13

Organic molecules can be shown with several types of formula. Using butane as the example:

Molecular formula: the actual number of atoms of each element in one molecule, C4H10.

Empirical formula: the simplest whole-number ratio of atoms of each element, C2H5.

Diagram

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