Ferric oxide crystallises 'in a hexagona...

Ferric oxide crystallises 'in a hexagonal close packed array of oxide ions with two out of ever three octahedral holes occupied by ferric. ion: Derive. the formula of the ferric oxide.

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Number of .Fe^3+=2/3. of octahedral voids .=2/3 xx 1=2/3 O^2. form củbic close packed lattice. .therefore O^i ldots are `8 xx 1/8=1` .Fe_2 / 3^3+ O_1^2 rarr Fe_2 O_3. is formula of ferric oxide.

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