Molar Mass of MgSO4·7H2O (Magnesium Sulfate Heptahydrate)
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What is the molar mass of MgSO4·7H2O?
Answer
M(MgSO4·7H2O) ≈
246.47 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.
MgSO4·7H2O = MgSO4 + 7 H2O → Mg 1, S 1, O 11, H 14
| Element | Atoms, n | Atomic weight, A | n × A, g/mol Mass fraction, w | |
|---|---|---|---|---|
| Mgmagnesium | 1 | 24.305 | 24.305 w ≈ 9.86% | ≈ 9.86% |
| Ssulfur | 1 | 32.06 | 32.06 w ≈ 13.01% | ≈ 13.01% |
| Ooxygen | 11 | 15.999 | 175.989 w ≈ 71.40% | ≈ 71.40% |
| Hhydrogen | 14 | 1.0080 | 14.1120 w ≈ 5.73% | ≈ 5.73% |
| Σ = 246.466 ≈ 246.47 g/mol w = 100% | 100% | |||
Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)
O 71.40%
S 13.01%Mg 9.86%H 5.73%
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Molar masses of substances nearby
| Formula | M, g/mol |
|---|---|
| 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 |
| CuSO₄·5H₂O (copper(II) sulfate pentahydrate) | 249.68 |
| (NH₄)₂Cr₂O₇ (ammonium dichromate) | 252.063 |