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Molar massPhosphoric acid
Molar mass of H3PO4 (Phosphoric acid)
The molar mass of H3PO4 is 97.99 g/mol.
A triprotic acid used in fertilisers and some soft drinks.
Step-by-step calculation
Add up the atomic masses of every atom in the formula:
3 × 1.008 + 1 × 30.974 + 4 × 15.999 = 97.99 g/mol
| Element | Atoms | Atomic mass (u) | Subtotal (g/mol) | % by mass |
|---|---|---|---|---|
| Hydrogen (H) | 3 | 1.008 | 3.024 | 3.09% |
| Phosphorus (P) | 1 | 30.974 | 30.974 | 31.61% |
| Oxygen (O) | 4 | 15.999 | 63.996 | 65.31% |
| Molar mass of H3PO4 | 97.99 g/mol | |||
Moles to grams for H3PO4
Multiply the number of moles by 97.99 g/mol to get the mass, and divide a mass by 97.99 g/mol to get the moles.
| Amount (mol) | Mass (g) | Mass (g) | Amount (mol) |
|---|---|---|---|
| 0.1 mol | 9.80 g | 1 g | 0.0102 mol |
| 0.25 mol | 24.50 g | 5 g | 0.0510 mol |
| 0.5 mol | 49.00 g | 10 g | 0.1020 mol |
| 1 mol | 97.99 g | 50 g | 0.5102 mol |
| 2 mol | 195.99 g | 100 g | 1.0205 mol |
| 5 mol | 489.97 g | 500 g | 5.1024 mol |
Frequently asked questions
What is the molar mass of H3PO4?
The molar mass of H₃PO₄ (phosphoric acid) is 97.99 g/mol, so one mole of phosphoric acid weighs 97.99 grams.
How do you calculate the molar mass of H3PO4?
Multiply each element’s atomic mass by the number of atoms in the formula and add the results: 3 × 1.008 + 1 × 30.974 + 4 × 15.999 = 97.99 g/mol.
What percentage of H3PO4 is oxygen?
Oxygen makes up 65.31% of the mass of H₃PO₄.
How many grams are in one mole of H3PO4?
One mole of H₃PO₄ has a mass of 97.99 grams, and contains 6.022 × 10²³ formula units.