Molar Mass of MgO (Magnesium Oxide)

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Chemical formula Write symbols with a capital letter: CoCl2 is cobalt chloride, COCl2 is phosgene. A hydrate takes a dot: CuSO4·5H2O or CuSO4.5H2O

What is the molar mass of MgO?

Answer

M(MgO) =
40.304 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
Mgmagnesium124.30524.305 w ≈ 60.30%
Ooxygen115.99915.999 w ≈ 39.70%
Σ = 40.304 g/mol w = 100%

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

Mass fractions of the elements

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Recalculate with different values ↑

Molar masses of substances nearby

FormulaM, g/mol
NaOH (sodium hydroxide)39.997
Ca (calcium)40.078
SiC (silicon carbide)40.096
MgO (magnesium oxide)40.304
C₂H₃N (acetonitrile)41.053
NaF (sodium fluoride)41.988
C₃H₆ (propylene)42.081

FAQ

What is the molar mass of MgO?

M(MgO) = 40.304 g/mol

How to calculate the molar mass of MgO?

Add up the atomic weights of all the atoms in the formula: 24.305 + 15.999 = 40.304 g/mol.

How many grams are in 2 moles of MgO?

m = n × M = 2 mol × 40.304 g/mol = 80.608 g.

See Also