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In Fe(NO3)3 there are 3 different elements. They are iron (Fe), nitrogen (N) and oxygen (O). Now, if you are asking how many elements are in ONE MOLECULE of Fe(NO3)3, then the answer would be
1Fe + 3N + 9O = 13 atoms/molecule.
If you are simply counting up the formula, it would be 9 atoms. However, this is an ionic compound so it is made of ions, not atoms, and if it's a solid the formula only shows the ratio of ions in a giant structure.
There are a total of 5 elements in Fe(NO3)3: iron (Fe), nitrogen (N), and oxygen (O).
The total number of atoms is here 45.
Calculus: 5 [1Fe + 2(1N + 3O)]=45
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