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Molecular Formula Calculator

Select or enter the compound, and its molar mass value to find the molecular formula.

Chemical Mole:

Molar Mass:

g/mol

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Molecular Formula Calculator

This molecular formula calculator finds the molecular formula of any compound based on its empirical formula and molar mass. It can handle formulas for both organic and inorganic compounds.

Molecular Formula:

A chemical formula that gives the total number of atoms of each element present in a molecule using symbols and subscripts is called the molecular formula.

Subscripts indicate the exact number of atoms present. A subscript can be zero, one (usually omitted), or greater. Example: CO₂ (carbon dioxide) has 1 carbon and 2 oxygen atoms.

Molecular Formula of Common Compounds:

Sr. #	Compound Name	Molecular Formula
1	Glucose	C₆H₁₂O₆
2	Sodium Chloride	NaCl
3	Hydrogen Peroxide	H₂O₂
4	Methane	CH₄
5	Water	H₂O

How To Calculate Molecular Formula?

Finding the molecular formula involves four main steps:

Step 1: Get The Required Information

The empirical formula of the compound
The molar mass of the compound (g/mol)

Step 2: Calculate Empirical Formula Mass (EFM)

Look up atomic masses of each element
Multiply the number of atoms by their atomic masses
Add all values to get the Empirical Formula Mass

Step 3: Determine the Multiplier (n)

Divide the molar mass by the empirical formula mass
Note: n must be a whole number

Step 4: Multiply Empirical Formula by n

Multiply each subscript in the empirical formula by n to get the molecular formula

Molecular Formula = n × (Empirical Formula)

Example:

Compound: BH₄, molar mass = 31.2 g/mol

Solution:

EFM = 10.811 + 1.008 + 1.008 + 1.008 + 1.008 = 14.843 g/mol

n = MM / EFM = 31.2 / 14.843 ≈ 2

Molecular Formula = 2 × (BH₄) = B₂H₈

Our molecular formula calculator automates this process for convenience.

FAQs:

What Is The Rule of Molecular Formula?

Single Atom: No subscript is written for one atom (e.g., H for Hydrogen).
Multiple Atoms: Subscript indicates the number of atoms (e.g., H₂O).

What Are Compounds With The Same Molecular Formula But Different Arrangements of Atoms?

Isomers are compounds with the same molecular formula but different arrangements of atoms, resulting in different physical and chemical properties.

References:

From Wikipedia: Chemical Formula

From Chem LibreTexts: Calculating Molecular Formulas for Compounds

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#	Atom	Molar Mass (MM) (g/mol)	Subtotal Mass (%)	Subtotal Mass (g/mol)