The formula of the compound is C₃D₄






In a crystalline compound, atoms C occupy CCP lattices while atoms D occupy 2/3rd tetrahedral voids. What is the formula of the compound?


Solution

Data: In CCP unit lattice points are 8 corners and 6 face centres where atoms C are present. 

Number of C atoms = ⅛×8 + ½×6

                                 =1+3=4

 In cubic unit cell, there are 8 tetrahedral voids. 

Number of D atoms = ⅔×8 = 16/3


The formula of the compound is C₃D₄

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