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


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Browse the list ofcommon chemical compounds.

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››More indevelopment onmolar mass and also molecular weight

In chemisattempt, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the variety of atoms of that aspect current in the formula, then including every one of these commodities together.

Using the chemical formula of the compound and also the regular table of facets, we have the right to include up the atomic weights and also calculate molecular weight of the substance.

The atomic weights provided on this site come from NIST, the National Institute of Standards and Technology. We use the many widespread isotopes. This is exactly how to calculate molar mass (average molecular weight), which is based on isotropically weighted avereras. This is not the very same as molecular mass, which is the mass of a solitary molecule of well-identified isotopes. For bulk stoichiometric calculations, we are normally determining molar mass, which may likewise be called typical atomic weight or average atomic mass.

Formula weights are particularly valuable in determining the loved one weights of reagents and also products in a chemical reactivity. These family member weights computed from the chemical equation are periodically called equation weights.

If the formula supplied in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The portion by weight of any atom or group of atoms in a compound have the right to be computed by splitting the full weight of the atom (or team of atoms) in the formula by the formula weight and multiplying by 100.

Finding molar mass starts via systems of grams per mole (g/mol). When calculating molecular weight of a chemical compound, it tells us exactly how many kind of grams are in one mole of that substance. The formula weight is sindicate the weight in atomic mass systems of all the atoms in a offered formula.

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A common repursuit on this site is to transform grams to moles. To finish this calculation, you have to recognize what substance you are trying to transform. The reason is that the molar mass of the substance affects the convariation. This website explains exactly how to discover molar mass.


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