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Molecular Weight
Calculate molecular weight of compounds
Formula: H2 O = 18.0150 g/mol
How It Works
Calculate the molecular weight (molar mass) of a chemical compound from its formula.
A molecular weight calculator computes the molar mass of a chemical compound based on its molecular formula. It sums the standard atomic weights of all constituent elements, each multiplied by the number of atoms of that element in the molecule. The result is expressed in grams per mole (g/mol). The calculator supports elements from the periodic table and uses standard atomic weights from IUPAC.
Results
Enter values to see results
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Quick Tips
- • Results update automatically as you type
- • Use Tab to navigate between fields
- • Press Enter to calculate
Frequently Asked Questions
How does the Molecular Weight work?
Simply enter your values into the input fields above. The Molecular Weight uses standard formulas to compute results instantly as you type or click.
Is the Molecular Weight free?
Yes, this calculator is completely free to use. No registration, no hidden fees, no limits.
How accurate are the results?
Results are computed using industry-standard mathematical formulas. For critical decisions, we recommend consulting a professional.
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