Molecular Formula Calculator

Determine the true molecular formula of a chemical compound based on its empirical formula, empirical mass, and the target molar mass. This calculator is essential for identifying the precise composition of newly synthesized or unknown materials in the lab.

How to Calculate Molecular Formula

The molecular formula is a whole-number multiple of the empirical formula. To find the multiplier, simply divide the true molar mass by the empirical molar mass.

Example Calculation

If the empirical formula is $CH_2O$ (Empirical Mass $\approx 30 \text{ g/mol}$) and the true molar mass is $180 \text{ g/mol}$:

1. Multiplier ($n$) = $180 / 30 = 6$
2. Multiply subscripts: $C_{(1 \times 6)}H_{(2 \times 6)}O_{(1 \times 6)}$
3. True Molecular Formula = $C_6H_{12}O_6$