Molar Mass of KH2PO4 (Monobasic Potassium Phosphate)

Molar Mass Calculator

What is the molar mass of KH₂PO₄?

Answer

M(KH₂PO₄) =

136.084 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	1	39.098	39.098 w ≈ 28.73%	≈ 28.73%
Hhydrogen	2	1.0080	2.0160 w ≈ 1.48%	≈ 1.48%
Pphosphorus	1	30.974	30.974 w ≈ 22.76%	≈ 22.76%
Ooxygen	4	15.999	63.996 w ≈ 47.03%	≈ 47.03%
Σ = 136.084 g/mol w = 100%				100%

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

Mass fractions of the elements

O 47.03%

K 28.73%P 22.76%H 1.48%

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Molar masses of substances nearby

Formula	M, g/mol
SnO (tin(II) oxide)	134.71
C₈H₉NO (acetanilide)	135.166
CaHPO₄ (dicalcium phosphate)	136.056
KH₂PO₄ (monobasic potassium phosphate)	136.084
CaSO₄ (calcium sulfate)	136.13
ZnCl₂ (zinc chloride)	136.28
C₆H₇N₃O (isoniazid)	137.142

FAQ

What is the molar mass of KH2PO4?

M(KH₂PO₄) = 136.084 g/mol

How to calculate the molar mass of KH₂PO₄?

Add up the atomic weights of all the atoms in the formula: 39.098 + 2 × 1.0080 + 30.974 + 4 × 15.999 = 136.084 g/mol.

How many grams are in 2 moles of KH₂PO₄?

m = n × M = 2 mol × 136.084 g/mol = 272.168 g.

See Also