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Enter the atomic symbol and corresponding mass percentage for each element to calculate the empirical formula.
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This empirical formula calculator is used to determine the whole number ratio of atoms in a compound based on the elemental composition (percentage by mass). It shows the complete solution of creating empirical formulas by considering these parameters: element symbol, mass, mole, and mole ratio.
“A formula that shows the ratio of elements in a compound without detailing the exact number of atomic arrangements”
An empirical formula finds the relative ratio of various atoms of compounds. E.g:
| Element | Mass Percentage | Molar Mass (g/mol) | Moles | Mole Ratio | Empirical Formula |
|---|---|---|---|---|---|
| C | 40 | 12.01 | 3.33 | 1 | C |
| H | 6.67 | 1.01 | 6.6 | 2 | H₂ |
| O | 53.33 | 16 | 3.33 | 1 | O |
Thus, the empirical formula for this compound is CH₂O which is named “Formaldehyde”.
Step 1: Calculate the percentage composition or mass of an element present in a compound.
Step 2: Change the mass into moles by dividing them by the atomic mass of that element.
Step 3: Find the smallest number of moles of the element
Step 4: Divide the number of moles by the smallest value of moles obtained in step # 3
Step 5: If there is a need to round off the value then obtain the nearest whole number and write in the form of an empirical formula.
Suppose a compound that is known to be composed of 52.1% carbon (C), 13.6% hydrogen (H), and 34.3% oxygen (O) by mass. So, by using the percentage masses, find the empirical formula of that compound.
Step # 1 - Find Percentage of Mass
The mass percentage of the given elements is:
Step # 2 - Convert Mass to Moles
Calculate the moles that are calculated by dividing the percentage mass by the atomic mass.
➥ Moles of Carbon = 52.1/12.011
= 4.34 mol
➥ Moles of Hydrogen = 13.6/1.008
= 13.50 mol
➥ Moles of Oxygen = 34.3/15.999
= 2.15 mol
Step # 3 - Find the Smallest Mole Value
From the above step, the smallest mole value is 2.15 mol.
Step # 4 - Calculate Mole Ratio
The mole ratio is determined by dividing the number of moles of each element by the smallest mole value:
➥ Mole ratio of Carbon = 4.34/2.15
= 2.02 (By rounding off this will be 2)
➥ Mole ratio of Hydrogen = 13.50/2.15
= 6.28 (by rounding off this will be 6)
➥ Mole ratio of Oxygen = 2.15/2.15
= 1
Step # 5 - Round off and Write the Empirical Formula
Based on the rounded mole ratios, the empirical formula for the compound is C₂H₆O. The empirical formula calculator automates rounding off the values to know the whole-number ratio of atoms for the compound.
The empirical formula is considered vital because it provides information about the number of atoms present in a compound. This property leads to identifying and characterizing various substances with similar functionalities.
The empirical formula of ethanol is:
C₂H₆OH
No, compounds do not have multiple empirical formulas. You can confirm it with the calculator that finds an empirical formula for a compound given its elemental composition.
Empirical Formula = C₂H₄O
Structural / Condensed formula = CH₃–CHO
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