1.

How many unit cell are present in a cubic-shaped ideal crystal of `NaCl` of mass `1.0 g`?A. `2.57xx10^(21)` unit cellsB. `5.14xx10^(21)` unit cellsC. `1.28xx10^(21)` unit cellsD. `1.71xx10^(21)` unit cells

Answer» Correct Answer - A
`(1)/(58.5)xx6.023xx10^(23)=1.029xx10^(22)`
A unit cell contains `4Na^(+)` ion and `4Cl^(-)` ions
`therefore` Unit cell `=(1.029xx10^(22))/(4)=2.57xx10^(21)` unit cell.


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