Question

How do you find the number of molecules or ions of 2.00 mol `Fe^(3+)`?

Answer 1

You have quoted a `2` `mol` quantity, this is `2xx6.022xx10^23` `Fe^(3+)` ions.

Explanation:

You can use the mole as you would any other collectve number, `"dozens, scores, grosses, centuries"`. If I have one mole of stuff there are `6.022xx10^23` individual items of that stuff.

You have `2` `mol` of `Fe^(3+)` ions, and thus `12.066xx10^23` `Fe^(3+)` ions.