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Molar massCalcium hydroxide
Molar mass of Ca(OH)2 (Calcium hydroxide)
The molar mass of Ca(OH)2 is 74.09 g/mol.
Slaked lime; its solution is limewater, the test for carbon dioxide.
Step-by-step calculation
Add up the atomic masses of every atom in the formula:
1 × 40.078 + 2 × 15.999 + 2 × 1.008 = 74.09 g/mol
| Element | Atoms | Atomic mass (u) | Subtotal (g/mol) | % by mass |
|---|---|---|---|---|
| Calcium (Ca) | 1 | 40.078 | 40.078 | 54.09% |
| Oxygen (O) | 2 | 15.999 | 31.998 | 43.19% |
| Hydrogen (H) | 2 | 1.008 | 2.016 | 2.72% |
| Molar mass of Ca(OH)2 | 74.09 g/mol | |||
Moles to grams for Ca(OH)2
Multiply the number of moles by 74.09 g/mol to get the mass, and divide a mass by 74.09 g/mol to get the moles.
| Amount (mol) | Mass (g) | Mass (g) | Amount (mol) |
|---|---|---|---|
| 0.1 mol | 7.41 g | 1 g | 0.0135 mol |
| 0.25 mol | 18.52 g | 5 g | 0.0675 mol |
| 0.5 mol | 37.05 g | 10 g | 0.1350 mol |
| 1 mol | 74.09 g | 50 g | 0.6748 mol |
| 2 mol | 148.18 g | 100 g | 1.3497 mol |
| 5 mol | 370.46 g | 500 g | 6.7484 mol |
Experiments that use calcium hydroxide
⚖️ Calculate any other formulaFrequently asked questions
What is the molar mass of Ca(OH)2?
The molar mass of Ca(OH)₂ (calcium hydroxide) is 74.09 g/mol, so one mole of calcium hydroxide weighs 74.09 grams.
How do you calculate the molar mass of Ca(OH)2?
Multiply each element’s atomic mass by the number of atoms in the formula and add the results: 1 × 40.078 + 2 × 15.999 + 2 × 1.008 = 74.09 g/mol.
What percentage of Ca(OH)2 is calcium?
Calcium makes up 54.09% of the mass of Ca(OH)₂.
How many grams are in one mole of Ca(OH)2?
One mole of Ca(OH)₂ has a mass of 74.09 grams, and contains 6.022 × 10²³ formula units.