# CHM 112 FE(OH)3 5

››Percent composition by element
 Element Symbol Atomic Mass # of Atoms Mass Percent Iron Fe 55.845 1 52.257% Hydrogen H 1.00794 3 2.830% Oxygen O 15.9994 3 44.914%

››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 list ofcommon chemical compounds.

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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.

A common request on this site is to lớn convert grams lớn moles. To complete this calculation, you have to 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 khổng lồ find molar 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 và multiplying by 100.

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

Using the chemical formula of the compound và the periodic table of elements, we can địa chỉ 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 và Technology. We use the most common isotopes. This is how to lớn 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.

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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.

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