Molar Mass of FeSO4·7H2O (Ferrous Sulfate Heptahydrate)
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What is the molar mass of FeSO4·7H2O?
Answer
M(FeSO4·7H2O) ≈
278.01 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.
7 H2O — water of crystallization, part of the molar mass: 7 × 18.015 = 126.105.
FeSO4·7H2O = FeSO4 + 7 H2O → Fe 1, S 1, O 11, H 14
| Element | Atoms, n | Atomic weight, A | n × A, g/mol Mass fraction, w | |
|---|---|---|---|---|
| Feiron | 1 | 55.845 | 55.845 w ≈ 20.09% | ≈ 20.09% |
| Ssulfur | 1 | 32.06 | 32.06 w ≈ 11.53% | ≈ 11.53% |
| Ooxygen | 11 | 15.999 | 175.989 w ≈ 63.30% | ≈ 63.30% |
| Hhydrogen | 14 | 1.0080 | 14.1120 w ≈ 5.08% | ≈ 5.08% |
| Σ = 278.006 ≈ 278.01 g/mol w = 100% | 100% | |||
Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)
O 63.30%
Fe 20.09%S 11.53%H 5.08%
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Molar masses of substances nearby
| Formula | M, g/mol |
|---|---|
| PbCO₃ (lead carbonate) | 267.2 |
| HgCl₂ (mercuric chloride) | 271.49 |
| Ag₂CO₃ (silver carbonate) | 275.75 |
| FeSO₄·7H₂O (ferrous sulfate heptahydrate) | 278.01 |
| PbCl₂ (lead chloride) | 278.1 |
| MgI₂ (magnesium iodide) | 278.11 |
| C₁₈H₃₄O₂ (oleic acid) | 282.468 |