Molar Mass of Calcium Hydroxide (Ca(OH)2)
Molar Mass of Calcium Hydroxide is a frequent exam value for base chemistry, particularly in mole-to-gram and back-conversion questions. Molar Mass of Ca(OH)₂ is 74.09 g/mol, based on 3 element types, with Ca 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 Calcium Hydroxide is:
74.09 g/mol
Molar Mass of Ca(OH)₂ equals 74.09 g/mol, so 74.09 grams is one mole.
Element Breakdown Table
| Element | Count | Atomic mass | Calculation | Contribution |
|---|---|---|---|---|
| Calcium (Ca) | 1 | 40.08 | 1 x 40.08 | 40.08 g/mol |
| Oxygen (O) | 2 | 16.00 | 2 x 16.00 | 32.00 g/mol |
| Hydrogen (H) | 2 | 1.01 | 2 x 1.01 | 2.02 g/mol |
Final molar mass 40.080 + 32.000 + 2.020 | 74.09 g/mol | |||
Computing Molar Mass of Calcium Hydroxide Step by Step
Molar Mass of Calcium Hydroxide: Step-by-Step Calculation
1. Identify Element Counts
Read Ca(OH)2 and list how many atoms of each element are present:
- 1 atom of Calcium (Ca)
- 2 atoms of Oxygen (O)
- 2 atoms of Hydrogen (H)
2. Determine Atomic Masses
Look up each element mass from the periodic table:
- Calcium (Ca) ~= 40.078 g/mol
- Oxygen (O) ~= 15.999 g/mol
- Hydrogen (H) ~= 1.008 g/mol
3. Multiply Atomic Mass by Quantity
Multiply atom count by atomic mass for each element:
- Calcium (Ca): 1 x 40.078 = 40.080 g/mol
- Oxygen (O): 2 x 15.999 = 32.000 g/mol
- Hydrogen (H): 2 x 1.008 = 2.020 g/mol
4. Sum Total Molar Mass
Add all contributions to get the final molar mass in g/mol.
Molar Mass = (1 x 40.078 + 2 x 15.999 + 2 x 1.008)
Molar Mass = 40.080 + 32.000 + 2.020
Molar Mass = 74.090 g/mol
Final rounded value shown on this page: 74.09 g/mol.
Visual Calculation Chart
| Element | Count | Mass | Count x mass | Contribution |
|---|---|---|---|---|
| Calcium (Ca) | 1 | 40.078 | 1 x 40.078 | = 40.080 |
| Oxygen (O) | 2 | 15.999 | 2 x 15.999 | = 32.000 |
| Hydrogen (H) | 2 | 1.008 | 2 x 1.008 | = 2.020 |
Final molar mass 40.080 + 32.000 + 2.020 | = 74.090 | |||
Easy Way to Remember
Easy way to remember Molar Mass of Calcium Hydroxide
- Molar Mass of Calcium Hydroxide: 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 |
|---|---|
| Neutralization | NaOH + HCl → NaCl + H₂O |
| Acidic oxide absorption | ₂NaOH + CO₂ → Na₂CO₃ + H₂O |
Use these reactions with molar mass calculations when you need the molar mass for each species.
Do You Know?
– Calcium Hydroxide contains 3 element types: Ca, O, H.
– Ca contributes the largest share of this compound's total molar mass.
– In Ca(OH)₂, O appears with the highest atom count.
– Its molar mass is 74.09 g/mol, which is used directly in gram-to-mole conversions.
– A common reaction for Calcium Hydroxide is neutralization (NaOH + HCl → NaCl + H₂O).
Why This Compound Matters
Calcium Hydroxide is used when studying neutralization, pH control, and measured base preparation.
H make it a common classroom comparison with acids and salts.
Similar calculations can be compared with Sodium Hydroxide (NaOH) and Potassium Hydroxide (KOH).
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 Ca(OH)₂ and miscounting atoms.
- Forgetting that parentheses in Ca(OH)₂ multiply the entire grouped part.
- Mixing up Ca element contribution with total molar mass.
- Reporting a value without units; final answer should be in g/mol for Calcium Hydroxide.
Quick Revision
Formula: Ca(OH)2
Molar Mass: 74.09 g/mol
Key takeaway: count atoms accurately, multiply by atomic masses, and sum only at the end.
Formula Explanation
Ca(OH)2 contains Calcium (Ca) (1), Oxygen (O) (2), Hydrogen (H) (2). Add each element contribution to get total molar mass.
FAQ
Conclusion
Molar Mass of Calcium Hydroxide and Molar Mass of Ca(OH)₂ are now easy to revise with this structured page. You can use this method in exams, lab reports, and daily chemistry practice.