Molar Mass of ZnSO4·7H2O (Zinc Sulfate Heptahydrate)
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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
| Element | Atoms, n | Atomic weight, A | n × A, g/mol Mass fraction, w | |
|---|---|---|---|---|
| Znzinc | 1 | 65.38 | 65.38 w ≈ 22.74% | ≈ 22.74% |
| Ssulfur | 1 | 32.06 | 32.06 w ≈ 11.15% | ≈ 11.15% |
| Ooxygen | 11 | 15.999 | 175.989 w ≈ 61.20% | ≈ 61.20% |
| Hhydrogen | 14 | 1.0080 | 14.1120 w ≈ 4.91% | ≈ 4.91% |
| Σ = 287.541 ≈ 287.54 g/mol w = 100% | 100% | |||
Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)
O 61.20%
Zn 22.74%S 11.15%H 4.91%
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Molar masses of substances nearby
| Formula | M, 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 |