Molar Mass of Calcium hydroxide
Ca(OH)2 — 74.092 g/mol, worked out element by element.
Molar mass of Calcium hydroxide, Ca(OH)₂
74.092 g/mol
Molecular weight 74.092 · 5 atoms per formula unit
Also known as: ca(oh)2, slaked lime, limewater.
Limewater — the solution that turns milky with carbon dioxide, which is the school test for the gas.
How 74.092 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Calcium | 1 | 40.078 | 40.078 | 54.09% |
| Oxygen | 2 | 15.999 | 31.998 | 43.19% |
| Hydrogen | 2 | 1.008 | 2.016 | 2.72% |
| Total | 5 | 74.092 | 100% |
M = 1 × 40.078 + 2 × 15.999 + 2 × 1.008 = 74.092 g/mol
Grams to moles for Calcium hydroxide
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0135 mol | 8.128 × 10^21 |
| 10 g | 0.1350 mol | 8.128 × 10^22 |
| 25 g | 0.3374 mol | 2.032 × 10^23 |
| 50 g | 0.6748 mol | 4.064 × 10^23 |
| 100 g | 1.3497 mol | 8.128 × 10^23 |
| 250 g | 3.3742 mol | 2.032 × 10^24 |
| 74.092 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 Calcium hydroxide?
The molar mass of Calcium hydroxide (Ca(OH)2) is 74.092 g/mol. That is the sum of the standard atomic weights of all 5 atoms in one formula unit: 1 × 40.078 + 2 × 15.999 + 2 × 1.008 = 74.092.
What is the molecular weight of Calcium hydroxide?
74.092 — 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 74.09 and a molar mass of 74.09 g/mol are the same answer.
How many moles are in 100 g of Calcium hydroxide?
100 ÷ 74.092 = 1.3497 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Calcium hydroxide?
By mass, Calcium hydroxide is 54.09% calcium, 43.19% oxygen, 2.72% hydrogen. Each element's share is its total mass in the formula divided by 74.092.
How many atoms are in one formula unit of Calcium hydroxide?
5: 1 calcium, 2 oxygen, 2 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Calcium hydroxide contains 5 × 6.022 × 10²³ atoms in total.