Empirical Formula Calculator
Two Elements (% or mass)
Enter percent or mass data for two elements
Three Elements (% or mass)
Empirical to Molecular Formula
Find molecular formula from empirical formula mass and actual molar mass
Formula
1. Convert mass % to moles: mol = mass / atomic mass | 2. Divide by smallest | 3. Multiply to whole numbers | 4. n = molar mass / empirical mass
Frequently Asked Questions
What is an empirical formula?
The empirical formula is the simplest whole-number ratio of atoms in a compound. For example, glucose (C6H12O6) has an empirical formula of CH2O. To find it, convert mass/percentage to moles, divide by the smallest, and round to whole numbers.
How is the molecular formula related to the empirical formula?
The molecular formula is a whole-number multiple of the empirical formula: molecular formula = n × empirical formula. Find n by dividing the actual molar mass by the empirical formula mass.
What if the ratios are not whole numbers?
If you get ratios like 1:1.5 or 1:1.33, multiply all ratios by 2, 3, or another small integer to get whole numbers. For example, 1:1.5 → multiply by 2 → 2:3.
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