Molar Mass of I2 (Iodine): Step by Step

What is the molar mass of I₂?

Answer

M(I₂) =

253.80 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024).

One I atom: M(I) = 126.90 g/mol; I₂ is two atoms.

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Iiodine	2	126.90	253.80 w = 100.00%	100.00%

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Formula	M, g/mol
CuSO₄·5H₂O (copper(II) sulfate pentahydrate)	249.68
(NH₄)₂Cr₂O₇ (ammonium dichromate)	252.063
BaCrO₄ (barium chromate)	253.32
I₂ (iodine)	253.80
S₈ (octasulfur)	256.48
C₆H₅Na₃O₇ (trisodium citrate)	258.069
Ba(NO₃)₂ (barium nitrate)	261.34