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An ion is the same thing as the regular atom, but with a different charge. This means that the regular atom gains or loses a number of electrons, which doesn't really affect the atom's molar mass since electrons are so light. In short, ions have basically the same molar mass as the original atom.
The molar mass does not change when you have an ion. For example, Fe and Fe3+ both have a molar mass of 55.845g/mol. The only difference between the atom (Fe) and ion (Fe3+) is that Fe3+ has 3 electrons. The molar mass remains the same because electrons do not have a large mass compared to the entire atom so their mass is disregarded in a way.
Considering that an ion just has a different charge than a regular atom since it is gaining or losing electrons, this doesn't have much of an impact of the molar mass since the electron weighs nearly nothing to be having an effect on the molar mass.
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