How does the Empirical Formula work?

Convert mass percentages to moles by dividing by atomic mass Then: Divide all mole values by the smallest value to get ratios Then: If ratios are not whole numbers, multiply all by a small integer (2, 3, or 4) Then: Write the empirical formula with the resulting whole-number subscripts.

Can you give an example of how to use the Empirical Formula?

Example: Input C:40%, H:6.67%, O:53.33% gives a result of CH₂O (glucose empirical formula) (C:3.33, H:6.67, O:3.33 → ratio 1:2:1).

Is the Empirical Formula free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Empirical Formula?

Our Empirical Formula uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Empirical Formula

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Element: mass% (comma separated)

e.g. C:40, H:6.67, O:53.33

The empirical formula of a compound shows the simplest whole-number ratio of atoms of each element present. It is derived from the percentage composition by mass. The molecular formula is a whole-number multiple of the empirical formula.

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Did You Know?

Glucose (C₆H₁₂O₆) and fructose both have the same empirical formula CH₂O, but are different molecules with different properties — demonstrating that empirical formulas alone don't identify a compound.

References

›Empirical formula — Wikipedia

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