Molar Mass of KIO3 (Potassium Iodate): Step by Step

What is the molar mass of KIO₃?

Answer

M(KIO₃) ≈

214.00 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 ≈ 18.27%	≈ 18.27%
Iiodine	1	126.90	126.90 w ≈ 59.30%	≈ 59.30%
Ooxygen	3	15.999	47.997 w ≈ 22.43%	≈ 22.43%
Σ = 213.995 ≈ 214.00 g/mol w = 100%				100%

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Formula	M, g/mol
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
Mn₂O₇ (manganese heptoxide)	221.869
C₃H₆N₆O₆ (cyclonite)	222.117