CHEMITRY CALCULATOR
Molar Mass
A precise tool.
What is the Molar Mass & How does it work?
The molar mass of a substance is the mass of one mole of that substance, and it is expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in the molecular formula of the compound.
Molar Mass = sum_{i=1}^{n} (Atomic Mass_i times Number of Atoms_i)
M = Molar Mass, A_i = Atomic Mass of element i, n = number of elements in the compound.
For example, the molar mass of water (H₂O) is calculated as follows: 2 × 1.008 g/mol (for hydrogen) + 16.00 g/mol (for oxygen) = 18.016 g/mol.
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Frequently Asked Questions
How do I calculate the molar mass of water?
The molar mass of water (H₂O) is calculated as 2 × 1.008 g/mol (for hydrogen) + 16.00 g/mol (for oxygen), which equals 18.016 g/mol.
What is the molar mass of carbon dioxide?
The molar mass of carbon dioxide (CO₂) is calculated as 12.01 g/mol (for carbon) + 2 × 16.00 g/mol (for oxygen), which equals 44.01 g/mol.
How do I use this calculator for a compound with multiple elements?
Enter the chemical formula and the number of atoms for each element. The calculator will sum the atomic masses to give you the molar mass.
Can this calculator handle isotopes?
No, this calculator uses standard atomic masses. For isotopic calculations, you would need to manually adjust the atomic masses.
What is the difference between molecular weight and molar mass?
Molecular weight is the sum of the atomic weights of all atoms in a molecule, while molar mass is the mass of one mole of molecules, expressed in grams per mole (g/mol).
How accurate are the atomic masses used in this calculator?
The atomic masses used are standard values from the periodic table and are generally very accurate for most chemical calculations.
Can I use this calculator for empirical formulas?
Yes, you can use this calculator to find the molar mass of an empirical formula by entering the elements and their respective counts as given in the formula.
Results are for informational purposes only and do not constitute professional advice.