Molar Mass of Sodium thiosulfate
Na2S2O3 — 158.097 g/mol, worked out element by element.
Molar mass of Sodium thiosulfate, Na₂S₂O₃
158.097 g/mol
Molecular weight 158.097 · 7 atoms per formula unit
Also known as: na2s2o3, hypo, sodium thiosulphate.
Photographic fixer, and the titrant for iodine in iodometry.
How 158.097 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Sulfur | 2 | 32.06 | 64.120 | 40.56% |
| Oxygen | 3 | 15.999 | 47.997 | 30.36% |
| Sodium | 2 | 22.99 | 45.980 | 29.08% |
| Total | 7 | 158.097 | 100% |
M = 2 × 32.060 + 3 × 15.999 + 2 × 22.990 = 158.097 g/mol
Grams to moles for Sodium thiosulfate
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0063 mol | 3.809 × 10^21 |
| 10 g | 0.0633 mol | 3.809 × 10^22 |
| 25 g | 0.1581 mol | 9.523 × 10^22 |
| 50 g | 0.3163 mol | 1.905 × 10^23 |
| 100 g | 0.6325 mol | 3.809 × 10^23 |
| 250 g | 1.5813 mol | 9.523 × 10^23 |
| 158.097 g | 1 mol | 6.022 × 10^23 |
For any other amount, use the molar mass calculator, or the molarity calculator to make up a solution of a given concentration.
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Frequently Asked Questions
What is the molar mass of Sodium thiosulfate?
The molar mass of Sodium thiosulfate (Na2S2O3) is 158.097 g/mol. That is the sum of the standard atomic weights of all 7 atoms in one formula unit: 2 × 32.060 + 3 × 15.999 + 2 × 22.990 = 158.097.
What is the molecular weight of Sodium thiosulfate?
158.097 — the same number as the molar mass, but as a dimensionless ratio rather than in g/mol. The two terms describe the same arithmetic, so a molecular weight of 158.10 and a molar mass of 158.10 g/mol are the same answer.
How many moles are in 100 g of Sodium thiosulfate?
100 ÷ 158.097 = 0.6325 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Sodium thiosulfate?
By mass, Sodium thiosulfate is 40.56% sulfur, 30.36% oxygen, 29.08% sodium. Each element's share is its total mass in the formula divided by 158.097.
How many atoms are in one formula unit of Sodium thiosulfate?
7: 2 sulfur, 3 oxygen, 2 sodium. One mole contains 6.02214076 × 10²³ formula units, so a mole of Sodium thiosulfate contains 7 × 6.022 × 10²³ atoms in total.