Molar Mass of MoO3

Molar Mass Calculator

What is the molar mass of MoO₃?

Answer

M(MoO₃) ≈

143.95 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — Mo: 95.95.

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Momolybdenum	1	95.95	95.95 w ≈ 66.66%	≈ 66.66%
Ooxygen	3	15.999	47.997 w ≈ 33.34%	≈ 33.34%
Σ = 143.947 ≈ 143.95 g/mol w = 100%				100%

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

Mass fractions of the elements

Mo 66.66%

O 33.34%

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Molar masses of substances nearby

Formula	M, g/mol
Ca(ClO)₂ (calcium hypochlorite)	142.98
Cu₂O (copper(I) oxide)	143.091
AgCl (silver chloride)	143.32
MoO₃	143.95
Al₄C₃ (aluminium carbide)	143.961
NaC₆H₅CO₂ (sodium benzoate)	144.105
Nd (neodymium)	144.24

FAQ

What is the molar mass of MoO3?

M(MoO₃) ≈ 143.95 g/mol

How to calculate the molar mass of MoO₃?

Add up the atomic weights of all the atoms in the formula: 95.95 + 3 × 15.999 = 143.947 ≈ 143.95 g/mol.

How many grams are in 2 moles of MoO₃?

m = n × M = 2 mol × 143.95 g/mol = 287.90 g.

See Also