Empirical Formula Calculator

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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Empirical Formula Calculator

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