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Question

An element crystallises into a structure which may be described by a cubic unit cell having one atom at each corner of the cube and two atoms on one of its diagonals. If the volume of this unit cell is 24×1024cm3 and density of element is 7.2 g/cm3. Calculate the number of atoms present in 200 g of the element.

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Solution

Number of atoms in a unit cell (Z)=1+2=3

Z=l3×ρ×NMM=l3×ρ×NZ=24×1024×7.2×6.023×10233=34.69Number of atoms=MassMolar mass×6.023×1023=20034.69×6.023×1023=3.47×1024

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