Aspect

Empirical Formula

Molecular Formula

Definition

Simplest whole-number ratio of elements

Exact number of atoms of each element in a molecule

Representation

Simplified ratio (not exact count of atoms)

Exact count of atoms in the compound

Example (Glucose)

CH₂O

C₆H₁₂O₆

Usefulness

Shows the simplest ratio, helpful in determining elemental composition

Provides detailed information about the actual molecule