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Molar massMagnesium sulfate
Molar mass of MgSO4 (Magnesium sulfate)
The molar mass of MgSO4 is 120.37 g/mol.
Epsom salt (as the heptahydrate).
Step-by-step calculation
Add up the atomic masses of every atom in the formula:
1 × 24.305 + 1 × 32.065 + 4 × 15.999 = 120.37 g/mol
| Element | Atoms | Atomic mass (u) | Subtotal (g/mol) | % by mass |
|---|---|---|---|---|
| Magnesium (Mg) | 1 | 24.305 | 24.305 | 20.19% |
| Sulfur (S) | 1 | 32.065 | 32.065 | 26.64% |
| Oxygen (O) | 4 | 15.999 | 63.996 | 53.17% |
| Molar mass of MgSO4 | 120.37 g/mol | |||
Moles to grams for MgSO4
Multiply the number of moles by 120.37 g/mol to get the mass, and divide a mass by 120.37 g/mol to get the moles.
| Amount (mol) | Mass (g) | Mass (g) | Amount (mol) |
|---|---|---|---|
| 0.1 mol | 12.04 g | 1 g | 0.0083 mol |
| 0.25 mol | 30.09 g | 5 g | 0.0415 mol |
| 0.5 mol | 60.18 g | 10 g | 0.0831 mol |
| 1 mol | 120.37 g | 50 g | 0.4154 mol |
| 2 mol | 240.73 g | 100 g | 0.8308 mol |
| 5 mol | 601.83 g | 500 g | 4.1540 mol |
Frequently asked questions
What is the molar mass of MgSO4?
The molar mass of MgSO₄ (magnesium sulfate) is 120.37 g/mol, so one mole of magnesium sulfate weighs 120.37 grams.
How do you calculate the molar mass of MgSO4?
Multiply each element’s atomic mass by the number of atoms in the formula and add the results: 1 × 24.305 + 1 × 32.065 + 4 × 15.999 = 120.37 g/mol.
What percentage of MgSO4 is oxygen?
Oxygen makes up 53.17% of the mass of MgSO₄.
How many grams are in one mole of MgSO4?
One mole of MgSO₄ has a mass of 120.37 grams, and contains 6.022 × 10²³ formula units.