1. Analyze the formula:
* Fe₂(C₂O₄)₃ represents one formula unit of iron(III) oxalate.
* Fe₂: There are 2 iron (Fe) atoms.
* (C₂O₄)₃: This indicates three oxalate (C₂O₄) groups.
* C₂O₄: Each oxalate group contains 2 carbon (C) atoms and 4 oxygen (O) atoms.
2. Calculate the total atoms per formula unit:
* Fe: 2 atoms
* C: 2 atoms/group * 3 groups = 6 atoms
* O: 4 atoms/group * 3 groups = 12 atoms
* Total atoms per formula unit: 2 + 6 + 12 = 20 atoms
3. Calculate the total atoms in 5 formula units:
* Total atoms: 20 atoms/formula unit * 5 formula units = 100 atoms
Therefore, there are a total of 100 atoms in 5 formula units of Fe₂(C₂O₄)₃.
