Molar Mass of C2H5Br (Bromoethane)

Molar Mass Calculator

What is the molar mass of C₂H₅Br?

Answer

M(C₂H₅Br) =

108.966 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
Ccarbon	2	12.011	24.022 w ≈ 22.05%	≈ 22.05%
Hhydrogen	5	1.0080	5.0400 w ≈ 4.63%	≈ 4.63%
Brbromine	1	79.904	79.904 w ≈ 73.33%	≈ 73.33%
Σ = 108.966 g/mol w = 100%				100%

Each fraction is rounded on its own, so the printed ones add up to 100.01%; unrounded, they make exactly 100%.

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

Mass fractions of the elements

Br 73.33%

C 22.05%H 4.63%

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Molar masses of substances nearby

Formula	M, g/mol
Fe(OH)₃ (iron(III) hydroxide)	106.866
Ag (silver)	107.87
N₂O₅ (dinitrogen pentoxide)	108.009
C₂H₅Br (bromoethane)	108.966
Li₂SO₄ (lithium sulfate)	109.94
C₆H₆O₂ (resorcin)	110.112
K₂S (potassium sulfide)	110.26

FAQ

What is the molar mass of C2H5Br?

M(C₂H₅Br) = 108.966 g/mol

How to calculate the molar mass of C₂H₅Br?

Add up the atomic weights of all the atoms in the formula: 2 × 12.011 + 5 × 1.0080 + 79.904 = 108.966 g/mol.

How many grams are in 2 moles of C₂H₅Br?

m = n × M = 2 mol × 108.966 g/mol = 217.932 g.

See Also