Molar Mass of Na2S2O3 (Sodium Thiosulfate)
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What is the molar mass of Na2S2O3?
Answer
M(Na2S2O3) ≈
158.10 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.
| Element | Atoms, n | Atomic weight, A | n × A, g/mol Mass fraction, w | |
|---|---|---|---|---|
| Nasodium | 2 | 22.990 | 45.980 w ≈ 29.08% | ≈ 29.08% |
| Ssulfur | 2 | 32.06 | 64.12 w ≈ 40.56% | ≈ 40.56% |
| Ooxygen | 3 | 15.999 | 47.997 w ≈ 30.36% | ≈ 30.36% |
| Σ = 158.097 ≈ 158.10 g/mol w = 100% | 100% | |||
Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)
S 40.56%
O 30.36%Na 29.08%
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Molar masses of substances nearby
| Formula | M, g/mol |
|---|---|
| C₆H₅Br (bromobenzene) | 157.010 |
| Gd (gadolinium) | 157.25 |
| KMnO₄ (potassium permanganate) | 158.032 |
| Na₂S₂O₃ (sodium thiosulfate) | 158.10 |
| (CH₃COO)₂Ca (calcium acetate) | 158.166 |
| K₂SO₃ (potassium sulfite) | 158.25 |
| CrCl₃ (chromic chloride) | 158.35 |