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Molecular Formula

The empirical formula is the simplest whole number ratio of atoms of each element in a compound.
The molecular formula is the actual whole number ratio of atoms of each element in a compound.
For example the empirical formula of glucose is CH2O. The actual whole number ratios of carbon: hydrogen: oxygen are 6: 12: 6 so the molecular formula is C6H12O6

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Specification: Edexcel Chemistry (8CH0), AS-level, Topic 5: Formulae, Equations and Amounts of Substance. Topic: Amount of Substance and Calculations.

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