ChemistryGa ( atomic mass 70 μ ) crystallizes in a hexagonal close packed structure. The total number of voids in 0.581 g of Ga is × 10 21 .(Round off to the Nearest Integer)

Ga ( atomic mass 70μ ) crystallizes in a hexagonal close packed structure. The total number of voids in 0.581 g of Ga is___ ×1021 .(Round off to the Nearest Integer)

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    Solution:

    Ga Crystallizes as H.C.P

    If number of Particles per unit cell = n ,  number. of Tetrahedron voids = 2n

     number. of octahedron voids =   n,    

     Total = 3n

    no. of Ga particles given WGAW×NA=0.58170×6.023×1023=0.0499×1023atom

    =0.58170×6.023×1023=0.0499×1023atom

    For one particles – 3 voids   0.0499×1023  ?

    0.0499×10231×3=0.1499×1023voids

    14.99×102115×1021  voids   X=15

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