Determine the molar mass formed between a sodium ion and an iodine ion

Answer is: molar mass of sodium iodide is 149.89424 g/mol.

Chemical reaction: Na⁺ + I⁻ → NaI.
The molar mass (M) is the mass of a given substance (in this example sodium iodide) divided by the amount of substance.
M(NaI) = Ar(Na) + Ar(I) · g/mol.
M(NaI) = 22.98977 + 126.90447 · g/mol.
M(NaI) = 149.89424 g/mol.

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