Molar Mass of MgCl2 (Magnesium Chloride)

Molar Mass Calculator

What is the molar mass of MgCl₂?

Answer

M(MgCl₂) ≈

95.21 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — Cl: 35.45.

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 ≈ 25.53%	≈ 25.53%
Clchlorine	2	35.45	70.90 w ≈ 74.47%	≈ 74.47%
Σ = 95.205 ≈ 95.21 g/mol w = 100%				100%

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

Mass fractions of the elements

Cl 74.47%

Mg 25.53%

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Molar masses of substances nearby

Formula	M, g/mol
C₆H₇N (aniline)	93.129
C₆H₆O (phenol)	94.113
K₂O (potassium oxide)	94.195
MgCl₂ (magnesium chloride)	95.21
CuS (copper monosulfide)	95.61
Mo (molybdenum)	95.95
NaC₃H₅O₂ (sodium propionate)	96.061

FAQ

What is the molar mass of MgCl2?

M(MgCl₂) ≈ 95.21 g/mol

How to calculate the molar mass of MgCl₂?

Add up the atomic weights of all the atoms in the formula: 24.305 + 2 × 35.45 = 95.205 ≈ 95.21 g/mol.

How many grams are in 2 moles of MgCl₂?

m = n × M = 2 mol × 95.21 g/mol = 190.42 g.

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