Molar Mass of K3PO4 (Tribasic Potassium Phosphate)

Molar Mass Calculator

What is the molar mass of K₃PO₄?

Answer

M(K₃PO₄) =

212.264 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
Kpotassium	3	39.098	117.294 w ≈ 55.26%	≈ 55.26%
Pphosphorus	1	30.974	30.974 w ≈ 14.59%	≈ 14.59%
Ooxygen	4	15.999	63.996 w ≈ 30.15%	≈ 30.15%
Σ = 212.264 g/mol w = 100%				100%

Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)

Mass fractions of the elements

K 55.26%

O 30.15%P 14.59%

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Molar masses of substances nearby

Formula	M, g/mol
BaCl₂ (barium chloride)	208.23
Bi (bismuth)	208.98
Sr(NO₃)₂ (strontium nitrate)	211.63
K₃PO₄ (tribasic potassium phosphate)	212.264
Al(NO₃)₃ (aluminum nitrate)	212.994
KIO₃ (potassium iodate)	214.00
HgO (mercury(II) oxide)	216.59

FAQ

What is the molar mass of K3PO4?

M(K₃PO₄) = 212.264 g/mol

How to calculate the molar mass of K₃PO₄?

Add up the atomic weights of all the atoms in the formula: 3 × 39.098 + 30.974 + 4 × 15.999 = 212.264 g/mol.

How many grams are in 2 moles of K₃PO₄?

m = n × M = 2 mol × 212.264 g/mol = 424.528 g.

See Also