Molar Mass of KNO3 (Potassium Nitrate)

Molar Mass Calculator

What is the molar mass of KNO₃?

Answer

M(KNO₃) =

101.102 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 ≈ 38.67%	≈ 38.67%
Nnitrogen	1	14.007	14.007 w ≈ 13.85%	≈ 13.85%
Ooxygen	3	15.999	47.997 w ≈ 47.47%	≈ 47.47%
Σ = 101.102 g/mol w = 100%				100%

Each fraction is rounded on its own, so the printed ones add up to 99.99%; unrounded, they make exactly 100%.

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

Mass fractions of the elements

O 47.47%K 38.67%

N 13.85%

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Molar masses of substances nearby

Formula	M, g/mol
C₇H₁₆ (n-heptane)	100.205
HClO₄ (perchloric acid)	100.45
Ru (ruthenium)	101.07
KNO₃ (potassium nitrate)	101.102
C₆H₁₅N (triethylamine)	101.193
Al₂O₃ (aluminium oxide)	101.961
C₄H₆O₃ (acetic anhydride)	102.089

FAQ

What is the molar mass of KNO3?

M(KNO₃) = 101.102 g/mol

How to calculate the molar mass of KNO₃?

Add up the atomic weights of all the atoms in the formula: 39.098 + 14.007 + 3 × 15.999 = 101.102 g/mol.

How many grams are in 2 moles of KNO₃?

m = n × M = 2 mol × 101.102 g/mol = 202.204 g.

See Also