How many unit cells are present in a cube-shaped ideal crystal of NaCl of mass 1.00 g ? [Atomic mass : Na=23 , Cl=35.5]

How many unit cells are present in a cube-shaped ideal crystal of NaCl

1.	How many unit cells are present in a cube-shaped ideal crystal of NaCl of mass 1.00 g ? [Atomic mass : Na=23 , Cl=35.5]
Answer» `5.14xx10^21` `1.28xx10^21` `1.71xx10^21` `2.57xx10^21` SOLUTION :ONE UNIT CELL HAS4 NaCl units , i.e., has mass `=(4xx58.5)/(6.02xx10^23)`g `therefore` No. of unit cell in 1 g =`(6.02xx10^23)/(4xx58.5)` `=2.57xx10^21`