The molar mass of H3PO4 is 97.97 g/mol.
To calculate the molar mass of H3PO4 it is necessary to multiply the atomic mass of each element by its subscript number:
- Hydrogen atomic mass: 1 g/mol
- Phosphorus atomic mass: 30.97 g/mol
- Oxygen atomic mass: 16 g/mol
Hydrogen: 1g/mol x 3 = 3 g/mol
Phosphorus : 30.97 g/mol x 1 = 30.97 g/mol
Oxygen: 16 g/mol x 4 = 64 g/mol
Finally, we add everything and we find that the molar mass of H3PO4 is 97.97 g/mol.