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Empirical Formula Calculator

Enter the atomic symbol and corresponding mass percentage for each element to calculate the empirical formula.

Element Mole:

Gram of Atom:

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Empirical Formula Calculator

This empirical formula calculator is used to determine the whole number ratio of atoms in a compound based on its elemental composition (percentage by mass). It shows the complete solution of creating empirical formulas by considering element symbol, mass, mole, and mole ratio.

What is an Empirical Formula?

“A formula that shows the ratio of elements in a compound without specifying the exact number of atoms in the molecule.”

An empirical formula represents the relative ratio of atoms in a compound. For example:

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, known as Formaldehyde.

Steps to Calculate Empirical Formula

Step 1: Calculate the percentage composition or mass of each element present in the compound.
Step 2: Convert the mass of each element into moles by dividing by its atomic mass.
Step 3: Identify the smallest number of moles among the elements.
Step 4: Divide the number of moles of each element by the smallest number of moles obtained in Step 3.
Step 5: If necessary, round off the resulting ratios to the nearest whole number to write the empirical formula.

Solved Example

Suppose a compound contains 52.1% carbon (C), 13.6% hydrogen (H), and 34.3% oxygen (O) by mass. Determine the empirical formula.

Solution:

Step 1 – Find Percentage of Mass:

C = 52.1%
H = 13.6%
O = 34.3%

Step 2 – Convert Mass to Moles:

Moles of C = 52.1 / 12.011 ≈ 4.34 mol
Moles of H = 13.6 / 1.008 ≈ 13.49 mol
Moles of O = 34.3 / 15.999 ≈ 2.15 mol

Step 3 – Find the Smallest Mole Value:

The smallest mole value among the elements is 2.15 mol.

Step 4 – Calculate Mole Ratio:

Mole ratio of C = 4.34 / 2.15 ≈ 2
Mole ratio of H = 13.49 / 2.15 ≈ 6
Mole ratio of O = 2.15 / 2.15 = 1

Step 5 – Round Off and Write the Empirical Formula:

Using the rounded ratios, the empirical formula is C2H6O.

FAQs

What is the significance of the empirical formula?

It shows the simplest ratio of atoms in a compound and helps identify substances with similar chemical properties.

What is the empirical formula of ethanol?

The empirical formula of ethanol is C2H5OH.

Can a compound have multiple empirical formulas?

No. A compound has only one empirical formula, determined by its elemental composition.

What is the empirical formula of acetaldehyde?

The empirical formula of acetaldehyde is CH3CHO.

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