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Ferric oxide crystalliizes in a hexagona...

Ferric oxide crystalliizes in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by ferric ions. Derive the formula of the ferric oxide.

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To derive the formula of ferric oxide (Fe₂O₃) based on the given information, we can follow these steps: ### Step 1: Understand the structure Ferric oxide crystallizes in a hexagonal close-packed (HCP) structure of oxide ions (O²⁻). In HCP, the number of oxide ions in one unit cell is 6. ### Step 2: Count the oxide ions Since the HCP structure contains 6 oxide ions, we have: - Number of O²⁻ ions = 6 ...
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