Molar Mass of KI (Potassium Iodide)

Molar Mass Calculator

What is the molar mass of KI?

Answer

M(KI) ≈

166.00 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — I: 126.90.

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 ≈ 23.55%	≈ 23.55%
Iiodine	1	126.90	126.90 w ≈ 76.45%	≈ 76.45%
Σ = 165.998 ≈ 166.00 g/mol w = 100%				100%

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

Mass fractions of the elements

I 76.45%

K 23.55%

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Molar masses of substances nearby

Formula	M, g/mol
Ca(NO₃)₂ (calcium nitrate)	164.086
Ho (holmium)	164.93
C₉H₁₁NO₂ (phenylalanine)	165.192
KI (potassium iodide)	166.00
C₈H₆O₄ (terephthalic acid)	166.132
KBrO₃ (potassium bromate)	166.999
Er (erbium)	167.26

FAQ

What is the molar mass of KI?

M(KI) ≈ 166.00 g/mol

How to calculate the molar mass of KI?

Add up the atomic weights of all the atoms in the formula: 39.098 + 126.90 = 165.998 ≈ 166.00 g/mol.

How many grams are in 2 moles of KI?

m = n × M = 2 mol × 166.00 g/mol = 332.00 g.

See Also