Molar mass of phosphorous acid (H3PO3)

The molar mass of phosphorous acid (H3PO3) is 81.995 g/mol.

Step-by-step calculation

Element	Atoms	Atomic mass	Subtotal
Hydrogen	× 3	1.008	= 3.024
Phosphorus	× 1	30.974	= 30.974
Oxygen	× 3	15.999	= 47.997
Total			81.995 g/mol

Percent composition by element

Hydrogen 3.69%
Phosphorus 37.78%
Oxygen 58.54%

Try another formula

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

Could not read that formula

Related compounds

H₃PO₄ Phosphoric acid (NH₄)₃PO₄ Ammonium phosphate NaH₂PO₄ Monosodium phosphate Na₂HPO₄ Disodium phosphate KH₂PO₄ Monopotassium phosphate K₂HPO₄ Dipotassium phosphate

FAQ

What is the molar mass of H3PO3?

The molar mass of phosphorous acid (H3PO3) is 81.995 g/mol.

How do you calculate the molar mass of H3PO3?

Multiply the atomic mass of each element by the number of its atoms in H3PO3, then add the results: 3 × 1.008 (H) + 1 × 30.974 (P) + 3 × 15.999 (O) = 81.995 g/mol.

What percentage of H3PO3 is Oxygen?

Oxygen makes up 58.54% of the mass of phosphorous acid (H3PO3).