Empirical Formula Calculator

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Empirical formula is one of the very basic and important concepts in Chemistry. Empirical formula is found by the simplest whole number ratio of number of atoms in a given compound and is the simplest chemical formula of a compound. Empirical formula calculator is the online tool used to find the empirical formula for the given atoms in a compound.


Example 1: Find the empirical formula of an unknown compound given the elemental composition data as: C= 48% O= 42%   H= 10%?

If considered the total composition of the compound=100 grams.

Then > mass of carbon C=48g, mass of oxygen O=42g, mass of hydrogen H=10g

Convert ‘grams’ to ‘moles’ >  moles of carbon=4.00, moles of oxygen=2.63, moles of hydrogen=9.92

Now divide moles of each element by the lowest number of moles.

Then we get  > The ratio of moles C:O:H= 1.52: 1:3.78.

Rounding the numbers to their nearest whole numbers, we get

The empirical formula= C2H1O4




Example 2: Find the empirical formula of an unknown compound given the elemental composition data as: Carbon C= 50% Nitrogen N= 50%?

If considered the total amount of the compound is 100 grams.

Then mass of carbon C=50g, mass of nitrogen N=50g

Now, convert ‘grams’ to ‘moles’

The amount of moles of each C and N are 4.16 and 3.57 respectively.

Now divide moles of each element by the lowest number of moles.

The ratio of Carbon moles: Nitrogen moles is 1.16: 1

This makes the possible empirical formula = CN.


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