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How many unit cells are present in a cube-shaped crystal of NaCl of mass 1.00g?

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How many unit cells are present in a cube-shaped crystal of NaCl of mass 1.00g?
A. `2.57xx10^(21)` unit cells
B. `5.14xx10^(21)` unit cells
C. `1.28xx10^(21)` unit cells
D. `1.71xx10^(21)` unit cells
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Correct Answer - 1
`58.5grArr"N"` formula units
`1grarr(N)/(58.5)` formula units
(b) 4 formula units `rarr` 1 unit cell
`(N)/(58.5)rarr(N)/(58.xx4)1"unit cell"=(6xx10^(23))/(234)`
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