Molar mass of Br = 79.904 g/mol
Convert grams Bromine to moles or moles Bromine to grams
Element Bromine (Br), Group 17, Atomic Number 35, p-block, Mass 79.904. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12) Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol. Weights of atoms and isotopes are from NIST article. Thus, the bromine molecule may be composed of two 79 Br atoms (mass 158 amu), two 81 Br atoms (mass 162 amu) or the more probable combination of 79 Br- 81 Br (mass 160 amu). Fragmentation of Br 2 to a bromine cation then gives rise to equal sized ion peaks at 79 and 81 amu. The principle of oxidation of bromide to bromine is shown by the addition of a little chlorine water to aqueous solutions of bromide. These become brown as elemental bromine forms. 2Br-+ Cl 2 → 2Cl-+ Br 2. Small amounts of bromine can also be made through the reaction of solid sodium bromide, NaBr, with concentrated sulphuric acid, H 2 SO 4.
| Symbol | # of Atoms | Bromine | Br | 79.904 | 1 | 100.000% |
Bromine consists of two isotopes with masses of 78.92 and 80.92 amu. What is the abundances of these two isotopes?
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.
The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. We use the most common isotopes. This is how to 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.
Bromine Mass Spectrum
Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. These relative weights computed from the chemical equation are sometimes called equation weights.
Bromine Mass
A common request on this site is to convert grams to moles. To complete this calculation, you have to 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 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 and multiplying by 100.
Bromine Mass Spectra
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.
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.