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The density of KBr is 2.73 g/cm. The len...

The density of KBr is 2.73 g/cm. The length of the unit cell is 654 pm. Find the number of molecules per unit cell in the cubic structure. 

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The correct Answer is:
4
`d=(Zm)/(a^(3)N),Z=(2.73xx6xx10^(13)xx(6.54)^(3)xx10^(-24))/(119)=3.85~~4`.
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