Free Empirical Formula Calculator
Find the mole ratio of two elements from their mass percentages to determine the simplest formula ratio.
g
g/mol
g
g/mol
Ratio of A (divide by smallest)
1.00
Moles of A3.3303 mol
Moles of B6.6468 mol
Ratio of B (divide by smallest)2.00
Ratio of A (divide by smallest) vs Mass of Element A
How to Find the Empirical Formula
Steps
1. Convert mass of each element to moles: moles = mass / atomic mass 2. Divide each by the smallest number of moles 3. Round to the nearest whole number to get subscripts
Example Calculation
A compound has 40 g C and 6.7 g H.
- 01Moles C = 40 / 12.011 = 3.33
- 02Moles H = 6.7 / 1.008 = 6.65
- 03Divide by smallest (3.33): C = 1, H = 2
- 04Empirical formula: CH2
Frequently Asked Questions
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