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Question

A compound formed by elements X, Y, Z . Atoms of Y forms ccp lattice and X occupies half the octahedral voids and Z occupies half the tetrahedral voids. Find the formula of the compound?

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Solution

  • Let, the number of close packed spheres be N,
    then:
    The number of octahedral voids generated = N
    The number of tetrahedral voids generated = 2N

Number of atoms of Y = N = 4

Number of atoms of X =1/2×N

=1/2×4

=2

Number of atoms of Z = 1/2 × 2N

=1/2×8

=4

The formula of the compound is X2Y4Z4

Also can be written as XY2Z2 .


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