Molar Mass of Copper(II) oxide
CuO — 79.545 g/mol, worked out element by element.
Molar mass of Copper(II) oxide, CuO
79.545 g/mol
Molecular weight 79.545 · 2 atoms per formula unit
Also known as: cuo, cupric oxide.
The black coating on heated copper, and an oxidising agent in combustion analysis.
How 79.545 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Copper | 1 | 63.546 | 63.546 | 79.89% |
| Oxygen | 1 | 15.999 | 15.999 | 20.11% |
| Total | 2 | 79.545 | 100% |
M = 1 × 63.546 + 1 × 15.999 = 79.545 g/mol
Grams to moles for Copper(II) oxide
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0126 mol | 7.571 × 10^21 |
| 10 g | 0.1257 mol | 7.571 × 10^22 |
| 25 g | 0.3143 mol | 1.893 × 10^23 |
| 50 g | 0.6286 mol | 3.785 × 10^23 |
| 100 g | 1.2572 mol | 7.571 × 10^23 |
| 250 g | 3.1429 mol | 1.893 × 10^24 |
| 79.545 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 Copper(II) oxide?
The molar mass of Copper(II) oxide (CuO) is 79.545 g/mol. That is the sum of the standard atomic weights of all 2 atoms in one formula unit: 1 × 63.546 + 1 × 15.999 = 79.545.
What is the molecular weight of Copper(II) oxide?
79.545 — 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 79.55 and a molar mass of 79.55 g/mol are the same answer.
How many moles are in 100 g of Copper(II) oxide?
100 ÷ 79.545 = 1.2572 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Copper(II) oxide?
By mass, Copper(II) oxide is 79.89% copper, 20.11% oxygen. Each element's share is its total mass in the formula divided by 79.545.
How many atoms are in one formula unit of Copper(II) oxide?
2: 1 copper, 1 oxygen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Copper(II) oxide contains 2 × 6.022 × 10²³ atoms in total.