››Percent composition by element
Element Symbol Atomic Mass # that Atoms Mass Percent
SodiumNa22.989770274.186%
OxygenO15.9994125.814%


››Calculate the molecular weightof a chemical link 0) location="/molarmass/" + urlencode(this.q.value); else alert("Please get in a chemistry formula or surname of a substance."); return false;">Enter a chemical formula: 0) location="/molarmass/" + urlencode(this.form.q.value); else alert("Please get in a chemistry formula or surname of a substance."); return false;">

Browse the list ofcommon chemistry compounds.

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››More information onmolar mass and also molecular weight

In chemistry, the formula load is a quantity computed by multiply the atomic weight (in atomic mass units) of each element in a chemical formula by the variety of atoms that that aspect present in the formula, then adding all that these assets together.

Finding molar fixed starts with units that grams every mole (g/mol). As soon as calculating molecular load of a chemistry compound, the tells united state how numerous grams space in one mole of the substance. The formula weight is simply the load in atomic mass units of all the atom in a offered formula.

Formula weights room especially helpful in determining the family member weights that reagents and also products in a chemical reaction. These family member weights computed indigenous the chemistry equation are sometimes called equation weights.

Using the chemical formula that the compound and also the periodic table that elements, we can add up the atom weights and also calculate molecular load of the substance.

The atom weights offered on this website come from NIST, the nationwide Institute that Standards and also Technology. We use the most usual isotopes. This is exactly how to calculation molar mass (average molecule weight), i beg your pardon is based upon isotropically load averages. This is not the exact same as molecule mass, i beg your pardon is the massive of a solitary molecule that well-defined isotopes. For mass stoichiometric calculations, we are usually determining molar mass, i beg your pardon may additionally be referred to as standard atomic weight or median atomic mass.

If the formula offered in calculating molar massive is the molecule formula, the formula weight computed is the molecule weight. The percent by load of any atom or team of atoms in a compound can be computed by separating the total weight that the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.

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A typical request top top this website is to convert grams come moles. To complete this calculation, you need to know what substance you room trying come convert. The factor is that the molar mass of the problem affects the conversion. This site defines how to find molar mass.


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