Molar Mass of Zinc oxide
ZnO — 81.379 g/mol, worked out element by element.
Molar mass of Zinc oxide, ZnO
81.379 g/mol
Molecular weight 81.379 · 2 atoms per formula unit
Also known as: zno.
Sunscreen, calamine and a semiconductor; it turns yellow when hot and white again when cool.
How 81.379 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Zinc | 1 | 65.38 | 65.380 | 80.34% |
| Oxygen | 1 | 15.999 | 15.999 | 19.66% |
| Total | 2 | 81.379 | 100% |
M = 1 × 65.380 + 1 × 15.999 = 81.379 g/mol
Grams to moles for Zinc oxide
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0123 mol | 7.400 × 10^21 |
| 10 g | 0.1229 mol | 7.400 × 10^22 |
| 25 g | 0.3072 mol | 1.850 × 10^23 |
| 50 g | 0.6144 mol | 3.700 × 10^23 |
| 100 g | 1.2288 mol | 7.400 × 10^23 |
| 250 g | 3.0720 mol | 1.850 × 10^24 |
| 81.379 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 Zinc oxide?
The molar mass of Zinc oxide (ZnO) is 81.379 g/mol. That is the sum of the standard atomic weights of all 2 atoms in one formula unit: 1 × 65.380 + 1 × 15.999 = 81.379.
What is the molecular weight of Zinc oxide?
81.379 — 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 81.38 and a molar mass of 81.38 g/mol are the same answer.
How many moles are in 100 g of Zinc oxide?
100 ÷ 81.379 = 1.2288 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Zinc oxide?
By mass, Zinc oxide is 80.34% zinc, 19.66% oxygen. Each element's share is its total mass in the formula divided by 81.379.
How many atoms are in one formula unit of Zinc oxide?
2: 1 zinc, 1 oxygen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Zinc oxide contains 2 × 6.022 × 10²³ atoms in total.