Molar Mass of KBr (Potassium Bromide)

Molar Mass Calculator

What is the molar mass of KBr?

Answer

M(KBr) =

119.002 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
Kpotassium	1	39.098	39.098 w ≈ 32.85%	≈ 32.85%
Brbromine	1	79.904	79.904 w ≈ 67.15%	≈ 67.15%
Σ = 119.002 g/mol w = 100%				100%

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

Mass fractions of the elements

Br 67.15%

K 32.85%

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Molar masses of substances nearby

Formula	M, g/mol
Sn (tin)	118.71
CoCO₃ (cobalt(II) carbonate)	118.941
Cl₂OS (thionyl chloride)	118.96
KBr (potassium bromide)	119.002
CHCl₃ (chloroform)	119.37
HMnO₄ (permanganic acid)	119.942
FeS₂ (ferrous disulfide)	119.97

FAQ

What is the molar mass of KBr?

M(KBr) = 119.002 g/mol

How to calculate the molar mass of KBr?

Add up the atomic weights of all the atoms in the formula: 39.098 + 79.904 = 119.002 g/mol.

How many grams are in 2 moles of KBr?

m = n × M = 2 mol × 119.002 g/mol = 238.004 g.

See Also