Choose the most correct answer. A compound forms hcp structure. Number of octahedral and tetrahedral voids in 0.5 mole of substance is respectively _______.

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A compound forms hcp structure. Number of octahedral and tetrahedral voids in 0.5 mole of substance is respectively `bb(underline(3.011 xx 10^23, 6.022 xx 10^23))`. Explanation: No. of atoms in 0.5 mol = 0.5 $\times$ 6.022 $\times$ 1023 = 3.011 $\times$ 1023 atoms No. of octahedral = No. of atoms Voids = 3.011 $\times$ 1023 No. of tetrahedral voids = 2 $\times$ No. of atoms = 2 $\times$ 3.011 $\times$ 1023 = 6.022 $\times$ 1023

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