Molar Mass of ZnSO4·7H2O (Zinc Sulfate Heptahydrate)

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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 ZnSO4·7H2O?

Answer

M(ZnSO4·7H2O) ≈
287.54 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — Zn: 65.38, S: 32.06.

7 H2O — water of crystallization, part of the molar mass: 7 × 18.015 = 126.105.

ZnSO4·7H2O = ZnSO4 + 7 H2O → Zn 1, S 1, O 11, H 14

Contribution of each element
Element Atoms, n Atomic weight, A n × A, g/mol Mass fraction, w
Znzinc165.3865.38 w ≈ 22.74%
Ssulfur132.0632.06 w ≈ 11.15%
Ooxygen1115.999175.989 w ≈ 61.20%
Hhydrogen141.008014.1120 w ≈ 4.91%
Σ = 287.541 ≈ 287.54 g/mol w = 100%

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

Mass fractions of the elements

Zn 22.74%S 11.15%H 4.91%

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Recalculate with different values ↑

Molar masses of substances nearby

FormulaM, g/mol
FeH₈N₂O₈S₂ (ferrous ammonium sulfate)284.04
C₁₈H₃₆O₂ (stearic acid)284.484
Na₂CO₃·10H₂O (sodium carbonate decahydrate)286.138
ZnSO₄·7H₂O (zinc sulfate heptahydrate)287.54
CaWO₄ (calcium tungstate)287.91
C₁₂H₂₅NaO₄S (sodium lauryl sulfate)288.38
CaI₂ (calcium iodide)293.88

FAQ

What is the molar mass of ZnSO4·7H2O?

M(ZnSO₄·7H₂O) ≈ 287.54 g/mol

Is the water counted in ZnSO₄·7H₂O?

Yes: the water of crystallization is part of the formula and of the molar mass. 7 H₂O add 7 × 18.015 = 126.105 g/mol; M(ZnSO₄·7H₂O) ≈ 287.54 g/mol, while anhydrous M(ZnSO₄) ≈ 161.44 g/mol.

How many grams are in 2 moles of ZnSO₄·7H₂O?

m = n × M = 2 mol × 287.54 g/mol = 575.08 g.

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