Molar Mass of As2O3 (Arsenic Trioxide)

Molar Mass Calculator

What is the molar mass of As₂O₃?

Answer

M(As₂O₃) =

197.841 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
Asarsenic	2	74.922	149.844 w ≈ 75.74%	≈ 75.74%
Ooxygen	3	15.999	47.997 w ≈ 24.26%	≈ 24.26%
Σ = 197.841 g/mol w = 100%				100%

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

Mass fractions of the elements

As 75.74%

O 24.26%

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Molar masses of substances nearby

Formula	M, g/mol
C₆H₁₂O₇ (D-gluconic acid)	196.155
Au (gold)	196.97
BaCO₃ (barium carbonate)	197.34
As₂O₃ (arsenic trioxide)	197.841
NaC₆H₇O₆ (sodium ascorbate)	198.106
CaBr₂ (calcium bromide)	199.886
Hg (mercury)	200.59

FAQ

What is the molar mass of As2O3?

M(As₂O₃) = 197.841 g/mol

How to calculate the molar mass of As₂O₃?

Add up the atomic weights of all the atoms in the formula: 2 × 74.922 + 3 × 15.999 = 197.841 g/mol.

How many grams are in 2 moles of As₂O₃?

m = n × M = 2 mol × 197.841 g/mol = 395.682 g.

See Also