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If the anions (A) from hexagonal closest packing and cations (c) accupy only 2/3 octahedral voids in it then the general formula of the compound

If the anions (A) from hexagonal closest packing and cations (c) accupy only 2/3 octahedral voids in it then the general formula of the compound

Grade:12th pass

2 Answers

Sneh Agrawal
29 Points
6 years ago
Number of A atoms per unit cell in hcp lattice=6. Number of octahedral voids=6 Number of octahedral voids occupied by C=(2/3)*6=4 Therefore formula of compound=C4A6=C2A3 Hope it helped. Best of luck:)
Rishi Sharma
askIITians Faculty 646 Points
3 years ago
Dear Student,
Please find below the solution to your problem.

For hexagonal close packed (hcp) crystal, there are six atoms per unit cell.Hence, A=6 (number of octahedral voids = number of atoms per unit cell).
Now C=32​ of 6 i.e. C=4.
Hence, C:A=4:6=2:3. Thus, the general formula is C2​A3​

Thanks and Regards

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