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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: OCR Chemistry A (H032), AS-level, 2.1.3 Amount of substance. Topic: Amount of Substance.

Key terms in this lesson

Empirical formula
The simplest whole number ratio of atoms of each element in a compound.

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