Molar Mass of HBr (Hydrogen Bromide)

Molar Mass Calculator

What is the molar mass of HBr?

Answer

M(HBr) =

80.912 g/mol

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

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Hhydrogen	1	1.0080	1.0080 w ≈ 1.25%	≈ 1.25%
Brbromine	1	79.904	79.904 w ≈ 98.75%	≈ 98.75%
Σ = 80.912 g/mol w = 100%				100%

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

Mass fractions of the elements

Br 98.75%

H 1.25%

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Molar masses of substances nearby

Formula	M, g/mol
Br (bromine)	79.904
NH₄NO₃ (ammonium nitrate)	80.043
SO₃ (sulfur trioxide)	80.06
HBr (hydrogen bromide)	80.912
H₂Se (hydrogen selenide)	80.987
ZnO (zinc oxide)	81.38
H₃PO₃ (phosphonic acid)	81.995

FAQ

What is the molar mass of HBr?

M(HBr) = 80.912 g/mol

How to calculate the molar mass of HBr?

Add up the atomic weights of all the atoms in the formula: 1.0080 + 79.904 = 80.912 g/mol.

How many grams are in 2 moles of HBr?

m = n × M = 2 mol × 80.912 g/mol = 161.824 g.

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