Molar Mass of Iron(II) sulfate
FeSO4 — 151.901 g/mol, worked out element by element.
Molar mass of Iron(II) sulfate, FeSO₄
151.901 g/mol
Molecular weight 151.901 · 6 atoms per formula unit
Also known as: feso4, ferrous sulfate, ferrous sulphate.
The iron in supplements, and a reducing agent that slowly oxidises in air.
How 151.901 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Oxygen | 4 | 15.999 | 63.996 | 42.13% |
| Iron | 1 | 55.845 | 55.845 | 36.76% |
| Sulfur | 1 | 32.06 | 32.060 | 21.11% |
| Total | 6 | 151.901 | 100% |
M = 4 × 15.999 + 1 × 55.845 + 1 × 32.060 = 151.901 g/mol
Grams to moles for Iron(II) sulfate
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0066 mol | 3.965 × 10^21 |
| 10 g | 0.0658 mol | 3.965 × 10^22 |
| 25 g | 0.1646 mol | 9.911 × 10^22 |
| 50 g | 0.3292 mol | 1.982 × 10^23 |
| 100 g | 0.6583 mol | 3.965 × 10^23 |
| 250 g | 1.6458 mol | 9.911 × 10^23 |
| 151.901 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 Iron(II) sulfate?
The molar mass of Iron(II) sulfate (FeSO4) is 151.901 g/mol. That is the sum of the standard atomic weights of all 6 atoms in one formula unit: 4 × 15.999 + 1 × 55.845 + 1 × 32.060 = 151.901.
What is the molecular weight of Iron(II) sulfate?
151.901 — 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 151.90 and a molar mass of 151.90 g/mol are the same answer.
How many moles are in 100 g of Iron(II) sulfate?
100 ÷ 151.901 = 0.6583 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Iron(II) sulfate?
By mass, Iron(II) sulfate is 42.13% oxygen, 36.76% iron, 21.11% sulfur. Each element's share is its total mass in the formula divided by 151.901.
How many atoms are in one formula unit of Iron(II) sulfate?
6: 4 oxygen, 1 iron, 1 sulfur. One mole contains 6.02214076 × 10²³ formula units, so a mole of Iron(II) sulfate contains 6 × 6.022 × 10²³ atoms in total.