Molar Mass of BaCl2·2H2O (Barium Chloride Dihydrate)

Molar Mass Calculator

What is the molar mass of BaCl₂·2H₂O?

Answer

M(BaCl₂·2H₂O) =

244.26 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024).

2 H₂O — water of crystallization, part of the molar mass: 2 × 18.015 = 36.030.

BaCl₂·2H₂O = BaCl₂ + 2 H₂O → Ba 1, Cl 2, H 4, O 2

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Babarium	1	137.33	137.33 w ≈ 56.22%	≈ 56.22%
Clchlorine	2	35.45	70.90 w ≈ 29.03%	≈ 29.03%
Hhydrogen	4	1.0080	4.0320 w ≈ 1.65%	≈ 1.65%
Ooxygen	2	15.999	31.998 w ≈ 13.10%	≈ 13.10%
Σ = 244.26 g/mol w = 100%				100%

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

Mass fractions of the elements

Ba 56.22%

Cl 29.03%O 13.10%H 1.65%

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Molar masses of substances nearby

Formula	M, g/mol
PbS (lead(II) sulfide)	239.3
Pb(OH)₂ (lead(II) hydroxide)	241.2
Fe(NO₃)₃ (ferric nitrate)	241.857
BaCl₂·2H₂O (barium chloride dihydrate)	244.26
C₁₀H₁₆N₂O₃S (biotin)	244.31
MgSO₄·7H₂O (magnesium sulfate heptahydrate)	246.47
Ag₂S (silver sulfide)	247.80

FAQ

What is the molar mass of BaCl2·2H2O?

M(BaCl₂·2H₂O) = 244.26 g/mol

Is the water counted in BaCl₂·2H₂O?

Yes: the water of crystallization is part of the formula and of the molar mass. 2 H₂O add 2 × 18.015 = 36.030 g/mol; M(BaCl₂·2H₂O) = 244.26 g/mol, while anhydrous M(BaCl₂) = 208.23 g/mol.

How many grams are in 2 moles of BaCl₂·2H₂O?

m = n × M = 2 mol × 244.26 g/mol = 488.52 g.

See Also