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1.19   Ferric oxide crystallises 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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Let the number of oxide ions be x.

Then, the number of octahedral voids = number of oxide ions = x.

According to question, number of ferric ions 

                                                                  = \frac{2}{3}x

Ratio of ferric ion: oxide ion = 2:3

So the required formula of the compound is Fe2O3.

Posted by

Devendra Khairwa

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