Molar Mass of Magnesium sulfate
MgSO4 — 120.361 g/mol, worked out element by element.
Molar mass of Magnesium sulfate, MgSO₄
120.361 g/mol
Molecular weight 120.361 · 6 atoms per formula unit
Also known as: mgso4, epsom salt, magnesium sulphate.
Epsom salts as the heptahydrate; anhydrous in the formula above.
How 120.361 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Oxygen | 4 | 15.999 | 63.996 | 53.17% |
| Sulfur | 1 | 32.06 | 32.060 | 26.64% |
| Magnesium | 1 | 24.305 | 24.305 | 20.19% |
| Total | 6 | 120.361 | 100% |
M = 4 × 15.999 + 1 × 32.060 + 1 × 24.305 = 120.361 g/mol
Grams to moles for Magnesium sulfate
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0083 mol | 5.003 × 10^21 |
| 10 g | 0.0831 mol | 5.003 × 10^22 |
| 25 g | 0.2077 mol | 1.251 × 10^23 |
| 50 g | 0.4154 mol | 2.502 × 10^23 |
| 100 g | 0.8308 mol | 5.003 × 10^23 |
| 250 g | 2.0771 mol | 1.251 × 10^24 |
| 120.361 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 Magnesium sulfate?
The molar mass of Magnesium sulfate (MgSO4) is 120.361 g/mol. That is the sum of the standard atomic weights of all 6 atoms in one formula unit: 4 × 15.999 + 1 × 32.060 + 1 × 24.305 = 120.361.
What is the molecular weight of Magnesium sulfate?
120.361 — 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 120.36 and a molar mass of 120.36 g/mol are the same answer.
How many moles are in 100 g of Magnesium sulfate?
100 ÷ 120.361 = 0.8308 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Magnesium sulfate?
By mass, Magnesium sulfate is 53.17% oxygen, 26.64% sulfur, 20.19% magnesium. Each element's share is its total mass in the formula divided by 120.361.
How many atoms are in one formula unit of Magnesium sulfate?
6: 4 oxygen, 1 sulfur, 1 magnesium. One mole contains 6.02214076 × 10²³ formula units, so a mole of Magnesium sulfate contains 6 × 6.022 × 10²³ atoms in total.