Molar Mass of Cobalt(II) Chloride (CoCl2)
Molar Mass of Cobalt(II) Chloride is commonly used in ionic-equation practice and concentration calculations for salt solutions. Molar Mass of CoCl₂ is 129.83 g/mol, based on 2 element types, with Cl 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 calculations.
Molar Mass of Cobalt(II) Chloride is:
129.83 g/mol
Molar Mass of CoCl₂ equals 129.83 g/mol, so 129.83 grams is one mole.
Element Breakdown Table
| Element | Count | Atomic mass | Calculation | Contribution |
|---|---|---|---|---|
| Cobalt (Co) | 1 | 58.93 | 1 x 58.93 | 58.93 g/mol |
| Chlorine (Cl) | 2 | 35.45 | 2 x 35.45 | 70.90 g/mol |
Final molar mass 58.930 + 70.900 | 129.83 g/mol | |||
Computing Molar Mass of Cobalt(II) Chloride Step by Step
Molar Mass of Cobalt(II) Chloride: Step-by-Step Calculation
1. Identify Element Counts
Read CoCl2 and list how many atoms of each element are present:
- 1 atom of Cobalt (Co)
- 2 atoms of Chlorine (Cl)
2. Determine Atomic Masses
Look up each element mass from the periodic table:
- Cobalt (Co) ~= 58.933 g/mol
- Chlorine (Cl) ~= 35.450 g/mol
3. Multiply Atomic Mass by Quantity
Multiply atom count by atomic mass for each element:
- Cobalt (Co): 1 x 58.933 = 58.930 g/mol
- Chlorine (Cl): 2 x 35.450 = 70.900 g/mol
4. Sum Total Molar Mass
Add all contributions to get the final molar mass in g/mol.
Molar Mass = (1 x 58.933 + 2 x 35.450)
Molar Mass = 58.930 + 70.900
Molar Mass = 129.830 g/mol
Final rounded value shown on this page: 129.83 g/mol.
Visual Calculation Chart
| Element | Count | Mass | Count x mass | Contribution |
|---|---|---|---|---|
| Cobalt (Co) | 1 | 58.933 | 1 x 58.933 | = 58.930 |
| Chlorine (Cl) | 2 | 35.450 | 2 x 35.450 | = 70.900 |
Final molar mass 58.930 + 70.900 | = 129.830 | |||
When you move to another formula, molar mass gives you the same step-by-step method for quick revision.
Easy Way to Remember
Easy way to remember Molar Mass of Cobalt(II) Chloride
- Molar Mass of Cobalt(II) Chloride: 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.
Sample Reactions
| Type | Reaction |
|---|---|
| Double displacement | AgNO₃ + NaCl → AgCl + NaNO₃ |
| Acid-salt reaction | Na₂CO₃ + ₂HCl → ₂NaCl + H₂O + CO₂ |
Do You Know?
– Cobalt(II) Chloride contains 2 element types: Co, Cl.
– Cl contributes the largest share of this compound's total molar mass.
– In CoCl₂, Cl appears with the highest atom count.
– Its molar mass is 129.83 g/mol, which is used directly in gram-to-mole conversions.
– A common reaction for Cobalt(II) Chloride is double displacement (AgNO₃ + NaCl → AgCl + NaNO₃).
Why This Compound Matters
Cobalt(II) Chloride 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 Chloride (NaCl) and Potassium Chloride (KCl).
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 CoCl₂ and miscounting atoms.
- Rounding atomic masses too early before finishing all multiplication steps.
- Mixing up Cl element contribution with total molar mass.
- Reporting a value without units; final answer should be in g/mol for Cobalt(II) Chloride.
Quick Revision
Formula: CoCl2
Molar Mass: 129.83 g/mol
Key takeaway: count atoms accurately, multiply by atomic masses, and sum only at the end.
Formula Explanation
CoCl2 contains Cobalt (Co) (1), Chlorine (Cl) (2). Add each element contribution to get total molar mass.
FAQ
Conclusion
Molar Mass of Cobalt(II) Chloride and Molar Mass of CoCl₂ are now easy to revise with this structured page. You can use this method in exams, lab reports, and daily chemistry practice.