Molar Mass of Copper(II) sulfate pentahydrate
CuSO4·5H2O — 249.677 g/mol, worked out element by element.
Molar mass of Copper(II) sulfate pentahydrate, CuSO₄·₅H₂O
249.677 g/mol
Molecular weight 249.677 · 21 atoms per formula unit · includes 5 waters of crystallisation
Also known as: cuso4.5h2o, blue vitriol, cuso4 5h2o.
The blue crystals. Heating drives off all five waters and turns them white, which is the standard hydrate experiment.
How 249.677 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Oxygen | 9 | 15.999 | 143.991 | 57.67% |
| Copper | 1 | 63.546 | 63.546 | 25.45% |
| Sulfur | 1 | 32.06 | 32.060 | 12.84% |
| Hydrogen | 10 | 1.008 | 10.080 | 4.04% |
| Total | 21 | 249.677 | 100% |
M = 9 × 15.999 + 1 × 63.546 + 1 × 32.060 + 10 × 1.008 = 249.677 g/mol
Grams to moles for Copper(II) sulfate pentahydrate
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0040 mol | 2.412 × 10^21 |
| 10 g | 0.0401 mol | 2.412 × 10^22 |
| 25 g | 0.1001 mol | 6.030 × 10^22 |
| 50 g | 0.2003 mol | 1.206 × 10^23 |
| 100 g | 0.4005 mol | 2.412 × 10^23 |
| 250 g | 1.0013 mol | 6.030 × 10^23 |
| 249.677 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) sulfate pentahydrate?
The molar mass of Copper(II) sulfate pentahydrate (CuSO4·5H2O) is 249.677 g/mol. That is the sum of the standard atomic weights of all 21 atoms in one formula unit: 9 × 15.999 + 1 × 63.546 + 1 × 32.060 + 10 × 1.008 = 249.677.
What is the molecular weight of Copper(II) sulfate pentahydrate?
249.677 — 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 249.68 and a molar mass of 249.68 g/mol are the same answer.
How many moles are in 100 g of Copper(II) sulfate pentahydrate?
100 ÷ 249.677 = 0.4005 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) sulfate pentahydrate?
By mass, Copper(II) sulfate pentahydrate is 57.67% oxygen, 25.45% copper, 12.84% sulfur, 4.04% hydrogen. Each element's share is its total mass in the formula divided by 249.677.
How many atoms are in one formula unit of Copper(II) sulfate pentahydrate?
21: 9 oxygen, 1 copper, 1 sulfur, 10 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Copper(II) sulfate pentahydrate contains 21 × 6.022 × 10²³ atoms in total.