Solid StateEasy
Question
How many unit cell are present in a cube-shaped ideal crystal of NaCl of mass 1.00 gm. [Atomic masses : Na = 23, Cl = 35.5]
Options
A.2.57 × 1021 unit cells
B.5.14 × 1021 unit cells
C.1.25 × 1021 unit cells
D.1.71 × 1021 unit cells
Solution
No. of moles in 1g = 
So. number of molecules =
× NA
∵ 4 molecules are present in one unit cell of NaCl.
∴
molecule, are present in = 
= 2.57 × 1021 unit cell of N
So. number of molecules =
× NA ∵ 4 molecules are present in one unit cell of NaCl.
∴
molecule, are present in = = 2.57 × 1021 unit cell of N
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