Molar Mass of CuSO4·5H2O (Copper(II) Sulfate Pentahydrate)

Molar Mass Calculator
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 CuSO4·5H2O?

Answer

M(CuSO4·5H2O) ≈
249.68 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — S: 32.06.

5 H2O — water of crystallization, part of the molar mass: 5 × 18.015 = 90.075.

CuSO4·5H2O = CuSO4 + 5 H2O → Cu 1, S 1, O 9, H 10

Contribution of each element
Element Atoms, n Atomic weight, A n × A, g/mol Mass fraction, w
Cucopper163.54663.546 w ≈ 25.45%
Ssulfur132.0632.06 w ≈ 12.84%
Ooxygen915.999143.991 w ≈ 57.67%
Hhydrogen101.008010.0800 w ≈ 4.04%
Σ = 249.677 ≈ 249.68 g/mol w = 100%

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

Mass fractions of the elements

Cu 25.45%S 12.84%H 4.04%

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Molar masses of substances nearby

FormulaM, g/mol
C₁₀H₁₆N₂O₃S (biotin)244.31
MgSO₄·7H₂O (magnesium sulfate heptahydrate)246.47
Ag₂S (silver sulfide)247.80
CuSO₄·5H₂O (copper(II) sulfate pentahydrate)249.68
(NH₄)₂Cr₂O₇ (ammonium dichromate)252.063
BaCrO₄ (barium chromate)253.32
I₂ (iodine)253.80

FAQ

What is the molar mass of CuSO4·5H2O?

M(CuSO₄·5H₂O) ≈ 249.68 g/mol

Is the water counted in CuSO₄·5H₂O?

Yes: the water of crystallization is part of the formula and of the molar mass. 5 H₂O add 5 × 18.015 = 90.075 g/mol; M(CuSO₄·5H₂O) ≈ 249.68 g/mol, while anhydrous M(CuSO₄) ≈ 159.60 g/mol.

How many grams are in 2 moles of CuSO₄·5H₂O?

m = n × M = 2 mol × 249.68 g/mol = 499.36 g.

See Also