Why is the atomic mass of iodine- $131$ not " $126.904 g / mol$ l"?

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Solution

Isotopes:
Isotopes are those elements that have the same atomic number but a different mass number.
An example is a chlorine atom has two isotopes: chlorine- $35$ and chlorine- $37$ .
Atomic mass
Each element has its own atomic mass.
The unit of atomic mass is u(unified mass)
The atomic mass of iodine:
The atomic mass of an iodine atom is $126.904$ , this means that it has $53$ protons and $74$ neutrons.
An isotope of iodine is iodine- $131$ , which has $53$ protons and $78$ neutrons.
The mass number of this isotope is $131$ .
As a result, the average atomic mass of iodine is $126.904$ , and iodine- $131$ is an isotope of iodine.

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Why is the atomic mass of iodine-131 not "126.904g/moll"?

Why is the atomic mass of iodine- $131$ not " $126.904 g / mol$ l"?