››Percent composition by element
Element Symbol Atomic Mass # of Atoms Mass Percent
AluminiumAl26.981538134.590%
HydrogenH1.0079433.877%
OxygenO15.9994361.533%


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

Browse the danh sách ofcomtháng chemical compounds.

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››More information onmolar mass và molecular weight

In chemistry, 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 number of atoms of that element present in the formula, then adding all of these products together.

Finding molar mass starts with units of grams per mole (g/mol). When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula.

Formula weights are especially useful in determining the relative weights of reagents & products in a chemical reaction. These relative sầu weights computed from the chemical equation are sometimes called equation weights.

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Using the chemical formula of the compound & the periodic table of elements, we can add up the atomic weights & calculate molecular weight of the substance.

The atomic weights used on this site come from NIST, the National Institute of Standards & Technology. We use the most common isotopes. This is how khổng lồ calculate molar mass (average molecular weight), which is based on isotropically weighted averages. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass.

If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.

A comtháng request on this site is khổng lồ convert grams khổng lồ moles. To complete this calculation, you have sầu lớn know what substance you are trying to convert. The reason is that the molar mass of the substance affects the conversion. This site explains how to lớn find molar mass.


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