Molar Mass of Sodium Thiosulfate (Na2S2O3)
Molar Mass of Sodium Thiosulfate makes it easier to move between measured grams and moles in classroom precipitation problems. Molar Mass of Na₂S₂O₃ is 158.10 g/mol, based on 3 element types, with S contributing the largest share.
For fast checks, use the calculate molar mass, verify element values in the periodic table with molar mass, or explore more molar mass page.
Molar Mass of Sodium Thiosulfate is:
158.10 g/mol
Molar Mass of Na₂S₂O₃ equals 158.10 g/mol, so 158.10 grams is one mole.
Element Breakdown Table
| Element | Count | Atomic mass | Calculation | Contribution |
|---|---|---|---|---|
| Sodium (Na) | 2 | 22.99 | 2 x 22.99 | 45.98 g/mol |
| Sulfur (S) | 2 | 32.06 | 2 x 32.06 | 64.12 g/mol |
| Oxygen (O) | 3 | 16.00 | 3 x 16.00 | 48.00 g/mol |
Final molar mass 45.980 + 64.120 + 48.000 | 158.10 g/mol | |||
Computing Molar Mass of Sodium Thiosulfate Step by Step
Molar Mass of Sodium Thiosulfate: Step-by-Step Calculation
1. Identify Element Counts
Read Na2S2O3 and list how many atoms of each element are present:
- 2 atoms of Sodium (Na)
- 2 atoms of Sulfur (S)
- 3 atoms of Oxygen (O)
2. Determine Atomic Masses
Look up each element mass from the periodic table:
- Sodium (Na) ~= 22.990 g/mol
- Sulfur (S) ~= 32.060 g/mol
- Oxygen (O) ~= 15.999 g/mol
3. Multiply Atomic Mass by Quantity
Multiply atom count by atomic mass for each element:
- Sodium (Na): 2 x 22.990 = 45.980 g/mol
- Sulfur (S): 2 x 32.060 = 64.120 g/mol
- Oxygen (O): 3 x 15.999 = 48.000 g/mol
4. Sum Total Molar Mass
Add all contributions to get the final molar mass in g/mol.
Molar Mass = (2 x 22.990 + 2 x 32.060 + 3 x 15.999)
Molar Mass = 45.980 + 64.120 + 48.000
Molar Mass = 158.100 g/mol
Final rounded value shown on this page: 158.10 g/mol.
Visual Calculation Chart
| Element | Count | Mass | Count x mass | Contribution |
|---|---|---|---|---|
| Sodium (Na) | 2 | 22.990 | 2 x 22.990 | = 45.980 |
| Sulfur (S) | 2 | 32.060 | 2 x 32.060 | = 64.120 |
| Oxygen (O) | 3 | 15.999 | 3 x 15.999 | = 48.000 |
Final molar mass 45.980 + 64.120 + 48.000 | = 158.100 | |||
Easy Way to Remember
Easy way to remember Molar Mass of Sodium Thiosulfate
- Molar Mass of Sodium Thiosulfate: count atoms, multiply masses, and add totals.
- Write each element in a table so you do not miss subscripts.
- Keep 2-3 decimals during steps, then round only at the end.
Use this checklist with molar mass guide whenever you want a quick confidence check.
Sample Reactions
| Type | Reaction |
|---|---|
| Double displacement | AgNO₃ + NaCl → AgCl + NaNO₃ |
| Acid-salt reaction | Na₂CO₃ + ₂HCl → ₂NaCl + H₂O + CO₂ |
Do You Know?
– Sodium Thiosulfate contains 3 element types: Na, S, O.
– S contributes the largest share of this compound's total molar mass.
– In Na₂S₂O₃, O appears with the highest atom count.
– Its molar mass is 158.10 g/mol, which is used directly in gram-to-mole conversions.
– A common reaction for Sodium Thiosulfate is double displacement (AgNO₃ + NaCl → AgCl + NaNO₃).
Why This Compound Matters
Sodium Thiosulfate appears in ionic-reaction practice and precipitation examples in school chemistry.
Its molar mass helps students move quickly between grams, moles, and concentration problems.
Similar calculations can be compared with Sodium Sulfate (Na2SO4) and Sodium Hydrogen Sulfate (NaHSO4).
Where This Is Used
- Competitive exams and school chemistry tests.
- Lab work when preparing measured solutions.
- Real-world manufacturing and quality checks.
Common Mistakes When Calculating This
- Skipping subscripts in Na₂S₂O₃ and miscounting atoms.
- Rounding atomic masses too early before finishing all multiplication steps.
- Mixing up S element contribution with total molar mass.
- Reporting a value without units; final answer should be in g/mol for Sodium Thiosulfate.
Quick Revision
Formula: Na2S2O3
Molar Mass: 158.10 g/mol
Key takeaway: count atoms accurately, multiply by atomic masses, and sum only at the end.
Formula Explanation
Na2S2O3 contains Sodium (Na) (2), Sulfur (S) (2), Oxygen (O) (3). Add each element contribution to get total molar mass.
FAQ
Conclusion
Molar Mass of Sodium Thiosulfate and Molar Mass of Na₂S₂O₃ are now easy to revise with this structured page. You can use this method in exams, lab reports, and daily chemistry practice.