Molar Mass of H3PO3 (Phosphonic Acid)
Molar Mass Calculator
What is the molar mass of H3PO3?
Answer
M(H3PO3) =
81.995 g/mol
Atomic weights: IUPAC standard values (CIAAW, 2024).
| Element | Atoms, n | Atomic weight, A | n × A, g/mol Mass fraction, w | |
|---|---|---|---|---|
| Hhydrogen | 3 | 1.0080 | 3.0240 w ≈ 3.69% | ≈ 3.69% |
| Pphosphorus | 1 | 30.974 | 30.974 w ≈ 37.78% | ≈ 37.78% |
| Ooxygen | 3 | 15.999 | 47.997 w ≈ 58.54% | ≈ 58.54% |
| Σ = 81.995 g/mol w = 100% | 100% | |||
Each fraction is rounded on its own, so the printed ones add up to 100.01%; unrounded, they make exactly 100%.
Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)
O 58.54%P 37.78%
H 3.69%
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Molar masses of substances nearby
| Formula | M, g/mol |
|---|---|
| HBr (hydrogen bromide) | 80.912 |
| H₂Se (hydrogen selenide) | 80.987 |
| ZnO (zinc oxide) | 81.38 |
| H₃PO₃ (phosphonic acid) | 81.995 |
| CH₃COONa (sodium acetate) | 82.034 |
| H₂SO₃ (sulfurous acid) | 82.07 |
| C₆H₁₀ (cyclohexene) | 82.146 |