Molar Mass of Calcium oxide
CaO — 56.077 g/mol, worked out element by element.
Molar mass of Calcium oxide, CaO
56.077 g/mol
Molecular weight 56.077 · 2 atoms per formula unit
Also known as: cao, quicklime, burnt lime.
Quicklime, from roasting limestone; the reaction with water is violent enough to boil it.
How 56.077 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Calcium | 1 | 40.078 | 40.078 | 71.47% |
| Oxygen | 1 | 15.999 | 15.999 | 28.53% |
| Total | 2 | 56.077 | 100% |
M = 1 × 40.078 + 1 × 15.999 = 56.077 g/mol
Grams to moles for Calcium oxide
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0178 mol | 1.074 × 10^22 |
| 10 g | 0.1783 mol | 1.074 × 10^23 |
| 25 g | 0.4458 mol | 2.685 × 10^23 |
| 50 g | 0.8916 mol | 5.370 × 10^23 |
| 100 g | 1.7833 mol | 1.074 × 10^24 |
| 250 g | 4.4582 mol | 2.685 × 10^24 |
| 56.077 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 oxide?
The molar mass of Calcium oxide (CaO) is 56.077 g/mol. That is the sum of the standard atomic weights of all 2 atoms in one formula unit: 1 × 40.078 + 1 × 15.999 = 56.077.
What is the molecular weight of Calcium oxide?
56.077 — 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 56.08 and a molar mass of 56.08 g/mol are the same answer.
How many moles are in 100 g of Calcium oxide?
100 ÷ 56.077 = 1.7833 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 oxide?
By mass, Calcium oxide is 71.47% calcium, 28.53% oxygen. Each element's share is its total mass in the formula divided by 56.077.
How many atoms are in one formula unit of Calcium oxide?
2: 1 calcium, 1 oxygen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Calcium oxide contains 2 × 6.022 × 10²³ atoms in total.