Molar Mass of CaSO4·2H2O (Calcium Sulfate Dihydrate)
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What is the molar mass of CaSO4·2H2O?
Answer
M(CaSO4·2H2O) ≈
172.16 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.
2 H2O — water of crystallization, part of the molar mass: 2 × 18.015 = 36.030.
CaSO4·2H2O = CaSO4 + 2 H2O → Ca 1, S 1, O 6, H 4
| Element | Atoms, n | Atomic weight, A | n × A, g/mol Mass fraction, w | |
|---|---|---|---|---|
| Cacalcium | 1 | 40.078 | 40.078 w ≈ 23.28% | ≈ 23.28% |
| Ssulfur | 1 | 32.06 | 32.06 w ≈ 18.62% | ≈ 18.62% |
| Ooxygen | 6 | 15.999 | 95.994 w ≈ 55.76% | ≈ 55.76% |
| Hhydrogen | 4 | 1.0080 | 4.0320 w ≈ 2.34% | ≈ 2.34% |
| Σ = 172.164 ≈ 172.16 g/mol w = 100% | 100% | |||
Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)
O 55.76%
Ca 23.28%S 18.62%H 2.34%
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Molar masses of substances nearby
| Formula | M, g/mol |
|---|---|
| AgNO₃ (silver nitrate) | 169.87 |
| Ba(OH)₂ (barium hydroxide) | 171.34 |
| CeO₂ (cerium(IV) oxide) | 172.12 |
| CaSO₄·2H₂O (calcium sulfate dihydrate) | 172.16 |
| Yb (ytterbium) | 173.05 |
| C₆H₇NO₃S (sulfanilic acid) | 173.19 |
| K₂HPO₄ (dibasic potassium phosphate) | 174.174 |