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Select compound, element, and enter the molecular formula. The calculator will take moments to calculate molecular weight, nominal, hill notation, and monoisotopic mass.
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An online molar mass calculator allows you to calculate the molecular weight, Hill notation, nominal mass, and monoisotopic mass for a given chemical formula. The atomic mass calculator can also display a pie chart showing mass percentage composition by element.
In chemistry, the molar mass of a compound is the mass of one mole of that substance. It is expressed in grams per mole (g/mol) and can be calculated by adding the standard atomic masses of all the atoms in the compound.
A mole is a standard counting unit in chemistry, containing Avogadro’s number of entities: 6.022 × 1023. The molar mass represents the total mass (in grams) of all atoms in one mole of a molecule.
| Element / Compound | Molar Mass (g/mol) |
|---|---|
| H2O | 18.02 |
| O | 16.00 |
| C | 12.01 |
| N | 14.01 |
| Ca | 40.08 |
| S | 32.06 |
| Ne | 20.18 |
| Ar | 39.95 |
| He | 4.00 |
| Pb | 207.20 |
| NO | 259.00 |
| I | 126.90 |
| B | 10.81 |
| Cr | 52.00 |
| F | 19.00 |
| CS | 132.91 |
Step 1: Analyze the chemical formula to determine the number of atoms of each element.
Step 2: Multiply the atomic mass of each element by the number of atoms in the compound.
Step 3: Sum all values to get the total molar mass in g/mol.
Total molar mass = 46 + 12 + 48 = 106 g/mol
Total molar mass = 23 + 16 + 1 = 40 g/mol
Avogadro’s number (NA) is the number of elementary entities (atoms, molecules, ions) in one mole: 6.022 × 1023.
The mole (mol) is the SI unit for the amount of substance. One mole contains as many entities as there are atoms in exactly 12 grams of carbon-12, i.e., 6.022 × 1023 particles.
The mass of one mole of a substance equals its molecular mass in grams. Example:
1.25 g of a substance with molecular weight 134.1 g/mol:
Moles = 1.25 × (1 mol / 134.1 g) = 0.0093 mol
It links the atomic scale to macroscopic laboratory quantities, ensuring precise chemical measurements.
The simplest whole-number ratio of atoms in a compound.
Used in mass spectrometry, it sums the exact masses of the most abundant stable isotopes for precise molecular mass measurements.
Depends on the substance. One mole of any element or compound has a mass equal to its atomic or molecular mass in grams.
Use an online molar mass calculator to quickly determine the molar mass and percent composition of a chemical formula. It supports common organic compounds for fast and accurate results.
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