Molar Mass of Br (Bromine)

Molar Mass Calculator

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	Mass fraction, w
Brbromine	1	79.904	79.904 w = 100.00%	100.00%

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

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Neighbouring elements of the periodic table

Formula	M, 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

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