Forums Assignment Help How Calculate the total number of voids?

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  • #180

    ahwriter
    Participant

    a. What is the total number of voids present in 1 mole of a compound forming hexagonal close-packed structure?

    b. Write the coordination number of each ion in CaF2.

    #8746

    Aakanksha
    Participant

    Solution:

    a. The number of atoms in the close-packing is 1 mole i.e., 1 × 6.022 × 1023 = 6.022 × 1023 atoms

    In closed-packing:

    Number of octahedral voids = Number of atoms = 6.022 × 1023

    Number of tetrahedral voids = 2 × Number of atoms in the close-packing

    = 2 × 6.022 × 1023

    = 12.044 × 1023

    Thus, total number of voids =6.022 × 1023 + 12.044 × 1023 = 18.066 × 1023

    Hence, the total number of voids in 1 mole of a compound forming hexagonal close-packed structure is 18.066 × 1023.

    b. In a molecule of CaF2, the coordination number of Ca2+is 8 and that of F−is 4.

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