Answer:
6.5×10²⁴ atoms Fe
Explanation:
First find moles of iron:
5.4 mol Fe₂O₃ × (2 mol Fe / mol Fe₂O₃) = 10.8 mol Fe
Now calculate atoms of iron:
10.8 mol Fe × (6.02×10²³ atoms Fe / mol Fe) = 6.5×10²⁴ atoms Fe
