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Grade 12IIT JEE Entrance Exam

The number of unit cells inb29.25 g of NaCl is...what?..i have got this question from an institute for unit test i need answer urgent

Profile image of Ragul
9 Years agoGrade 12
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1 Answer

Profile image of Arun
6 Years ago
The molar mass of NaCl is ⇒23+35.5=58.5 g. 
 
Thus, 58.5 g of NaCl corresponds to 1 mole of NaCl and contains 6.023×10 
23
  molecules.
 
One unit cell of NaCl (fcc structure) has 4 NaCl molecules. Hence, 1 mole of NaCl will contain  
4
6.023×10 
23
 
​ 
 ≈1.5×10 
23
  unit cells.
 
The number of unit cells in 58.5 g of NaCl is nearly 1.5×10 
23
 .

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