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This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. Atoms, Molecules, Moles, Molar Mass Cl2 is a molecule that is made up of two chlorine atoms.
MOLAR MASS OF CL HOW TO
This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. The fact that it is an ion (which, by definition has either lost or gained some extra electrons) will not affect the calculation. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. Answer: You find the molar mass of an ion the same way you would for a neutral molecule: add up the atomic masses of all the atoms in the formula.
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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. This site explains how to find molar mass. The reason is that the molar mass of the substance affects the conversion. The average molecular mass of a chloroform molecule is therefore equal to the sum of the average atomic masses of these atoms. To complete this calculation, you have to know what substance you are trying to convert. These relative weights computed from the chemical equation are sometimes called equation weights.Ī common request on this site is to convert grams to moles. 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.įormula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction.
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The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. Percent Composition and Molecular Formula. When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. Chlorine Cl 17 35.453 Promethium Pm 61 (145) Chromium Cr 24 51.996 Protactinium Pa 91 213.04 Cobalt Co 27 58.933 Radium Ra. Mole Calculations Review Molar Mass Practice Find the molar masses of the following compounds: 1) NaBr 2) PbSO4 3) Ca(OH)2 4) Na3PO4 5) (NH4)2CO3 6) C6H12O6 7) Fe3(PO4)2 8) (NH4)2S 9) Zn(C2H3O2)2. 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.įinding molar mass starts with units of grams per mole (g/mol).