Molar Mass of MgI2 (Magnesium Iodide)

Molar Mass Calculator

What is the molar mass of MgI₂?

Answer

M(MgI₂) ≈

278.11 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — I: 126.90.

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Mgmagnesium	1	24.305	24.305 w ≈ 8.74%	≈ 8.74%
Iiodine	2	126.90	253.80 w ≈ 91.26%	≈ 91.26%
Σ = 278.105 ≈ 278.11 g/mol w = 100%				100%

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

Mass fractions of the elements

I 91.26%

Mg 8.74%

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Molar masses of substances nearby

Formula	M, g/mol
Ag₂CO₃ (silver carbonate)	275.75
FeSO₄·7H₂O (ferrous sulfate heptahydrate)	278.01
PbCl₂ (lead chloride)	278.1
MgI₂ (magnesium iodide)	278.11
C₁₈H₃₄O₂ (oleic acid)	282.468
P₄O₁₀ (phosphorus pentoxide)	283.886
FeH₈N₂O₈S₂ (ferrous ammonium sulfate)	284.04

FAQ

What is the molar mass of MgI2?

M(MgI₂) ≈ 278.11 g/mol

How to calculate the molar mass of MgI₂?

Add up the atomic weights of all the atoms in the formula: 24.305 + 2 × 126.90 = 278.105 ≈ 278.11 g/mol.

How many grams are in 2 moles of MgI₂?

m = n × M = 2 mol × 278.11 g/mol = 556.22 g.

See Also