The formula weight is simply the weight in atomic mass units of all the atoms in a given formula.Ĭ provides an online conversion calculator for all types of measurement units. When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.įinding molar mass starts with units of grams per mole (g/mol). For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. 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. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. These relative weights computed from the chemical equation are sometimes called equation weights. This site explains how to find molar mass.įormula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. The reason is that the molar mass of the substance affects the conversion. To complete this calculation, you have to know what substance you are trying to convert. 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.Ī common request on this site is to convert grams to moles. Moles LiCl to grams, or enter other units to convert below: Enter two units to convert From: So the molecular weight of Lithium chloride is 42.3937.You can do the reverse unit conversion from Molecular weight of Lithium chloride (LiCl): Step 4: Calculate the molecular weight of Lithium chloride by adding up the total weight of all atoms. Total weight of Chlorine atoms in Lithium chloride: 35.4527 x 1 = 35.4527 Number of Chlorine atoms in Lithium chloride: 1 Total weight of Lithium atoms in Lithium chloride: 6.941 x 1 = 6.941 Number of Lithium atoms in Lithium chloride: 1 Step 3: Calculate the molecular weight of Lithium chloride by adding the total weight of all atoms. Step 2: Find out the atomic weights of each atom (from the periodic table).Ītomic weight of Lithium (Li) : 6.941 (Ref: jlab-ele003)Ītomic weight of chlorine (Cl) : 35.4527 (Ref: Pubchem-Chlorine, Jlab-ele003) From the chemical formula of Lithium chloride, it is easy to find out that there are one Lithium (Li) atom and one Chlorine (Cl) atom in a molecule of Lithium chloride. Chemical formula of Lithium chloride is LiCl. Step 1: Find out the chemical formula and determine constituent atoms and their number in a Lithium Chloride molecule.įrom the chemical formula, you will know different atoms and their number in a Lithium chloride molecule. Note that the value of atomic weight may differ from different sources. The sum of total atomic weight of all constituent elements will be the molecular weight of the compound. Then calculate the total atomic weight of each element by multiplying its atomic weight by its number. To calculate molecular weight of any compound, the first step is to know the constituent elements (atoms) and their number in that particular compound. The molecular weight of Lithium Chloride (LiCl) is 42.3937.
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