Molar Mass of H3PO4 (Phosphoric Acid)

Molar Mass Calculator

What is the molar mass of H₃PO₄?

Answer

M(H₃PO₄) =

97.994 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024).

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Hhydrogen	3	1.0080	3.0240 w ≈ 3.09%	≈ 3.09%
Pphosphorus	1	30.974	30.974 w ≈ 31.61%	≈ 31.61%
Ooxygen	4	15.999	63.996 w ≈ 65.31%	≈ 65.31%
Σ = 97.994 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)

Mass fractions of the elements

O 65.31%

P 31.61%H 3.09%

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Molar masses of substances nearby

Formula	M, g/mol
ZnS (zinc sulfide)	97.44
Cu(OH)₂ (cupric hydroxide)	97.560
NH₄Br (ammonium bromide)	97.943
H₃PO₄ (phosphoric acid)	97.994
C₄H₂O₃ (maleic anhydride)	98.057
H₂SO₄ (sulfuric acid)	98.07
CH₃COOK (potassium acetate)	98.142

FAQ

What is the molar mass of H3PO4?

M(H₃PO₄) = 97.994 g/mol

How to calculate the molar mass of H₃PO₄?

Add up the atomic weights of all the atoms in the formula: 3 × 1.0080 + 30.974 + 4 × 15.999 = 97.994 g/mol.

How many grams are in 2 moles of H₃PO₄?

m = n × M = 2 mol × 97.994 g/mol = 195.988 g.

See Also