Molar mass of phosphoric acid (H3PO4)

The molar mass of phosphoric acid (H3PO4) is 97.994 g/mol.

Step-by-step calculation

Element	Atoms	Atomic mass	Subtotal
Hydrogen	× 3	1.008	= 3.024
Phosphorus	× 1	30.974	= 30.974
Oxygen	× 4	15.999	= 63.996
Total			97.994 g/mol

Percent composition by element

Hydrogen 3.09%
Phosphorus 31.61%
Oxygen 65.31%

Phosphoric acid facts

Phosphoric acid is a colorless, odorless acid that is usually sold as a thick, syrupy solution in water.
Most of it is used to make phosphate fertilizers, and food-grade phosphoric acid gives cola drinks their tangy taste.
It is a triprotic acid, meaning each molecule can release up to three hydrogen ions, one step at a time.

Try another formula

H₂O NaCl CO₂ C₆H₁₂O₆ H₂SO₄ Ca(OH)₂ CuSO₄·5H₂O C₈H₁₀N₄O₂

Could not read that formula

Related compounds

(NH₄)₃PO₄ Ammonium phosphate H₃PO₃ Phosphorous acid NaH₂PO₄ Monosodium phosphate Na₂HPO₄ Disodium phosphate KH₂PO₄ Monopotassium phosphate K₂HPO₄ Dipotassium phosphate

FAQ

What is the molar mass of H3PO4?

The molar mass of phosphoric acid (H3PO4) is 97.994 g/mol.

How do you calculate the molar mass of H3PO4?

Multiply the atomic mass of each element by the number of its atoms in H3PO4, then add the results: 3 × 1.008 (H) + 1 × 30.974 (P) + 4 × 15.999 (O) = 97.994 g/mol.

What percentage of H3PO4 is Oxygen?

Oxygen makes up 65.31% of the mass of phosphoric acid (H3PO4).