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Use Avogadro's number.

2 mole Fe(3+) ( 6.022 X 10^23/1 mole Fe(3+) )

= 1.20 X 10^24 ions of Fe(3+)

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Q: How do you find the number of ions in 2 mol of Fe3 plus?
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What.........Fe2O3 is named iron (III) oxide because it contains . a. three unpaired electrons c. three iron atoms b. Fe3 plus ions d. O3 plus ions?

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The name iron III oxide shows that you have two types of ion in the compound, the iron III ion (Fe3+) and the oxide ion (O2-). What you need to do is find what ratio to combine the ions in so that the positive and negative charges cancel out to zero. One way of doing this is to switch the numbers of each ion's charge, and assign it to the opposite ion, so in this case you get 2 Fe3+ ions and 3 O2- ions. So the formula is Fe2O3