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    Molar Mass of Br (Bromine)

    Molar Mass Calculator
    Chemical formula

    What is the molar mass of Br?

    Answer

    M(Br) =
    79.904 g/mol

    Atomic weights: IUPAC standard values (CIAAW, 2024).

    Elemental bromine is made of Br2 molecules: M(Br2) = 159.808 g/mol = 0.159808 kg/mol.

    Contribution of each element
    Element Atoms, n Atomic weight, A n × A, g/mol Mass fraction, w
    Brbromine179.90479.904 w = 100.00%

    Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)

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    Molar Mass of Br (Bromine): Step by Step. M(Br) = 79.904 g/mol: the standard atomic weight of bromine (IUPAC, CIAAW 2024). Molecule M(Br2) = 159.808 g/mol.
    https://calculat.io/en/other/molar-mass/br/generated.jpgCopy

    Neighbouring elements of the periodic table

    FormulaM, g/mol
    Ge (germanium)72.630
    As (arsenic)74.922
    Se (selenium)78.971
    Br (bromine)79.904
    Kr (krypton)83.798
    Rb (rubidium)85.468
    Sr (strontium)87.62
    Recalculate with different values ↑

    FAQ

    What is the molar mass of Br?

    M(Br) = 79.904 g/mol

    Why is the molar mass of bromine 79.904 and not 160?

    79.904 g/mol is the mass of one mole of Br atoms. Elemental bromine is made of Br₂ molecules: M(Br₂) = 2 × 79.904 = 159.808 g/mol (160 in school problems); in SI units, 0.159808 kg/mol. In a problem about the gas, the molar mass of bromine is usually M(Br₂).

    How many grams are in 2 moles of Br?

    m = n × M = 2 mol × 79.904 g/mol = 159.808 g.

    See Also