Question

The molecules of element Y form hcp lattice and the molecules of element A are engaged in 1/3 of the isotopic holes. What is the formula for the combination formed by the elements X and Y?​

Answer 1

Answer:

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Answer 2

Answer:

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Explanation:

Given that, atoms of B forms hcp lattice. So, the atoms at corners are shared by 6 unit cells. So, its contribution is   6 1

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; Face centered atoms contribute   2 1

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 and middle layer atoms contribute 1 each.

So, effective number of atoms in unit cell =  6 1

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×12+  2 1 ×2+1×3 =2+1+3=6

Number of tetrahedral voids =2× Number of atoms forming the lattice. =2×6=12

So, number of atoms of A=  32 ×12=8

Number of atoms of B=6

So, A:B⇒A:B

    8:6        4:3

So, formula is A4  B3

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