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Lithium borohydride crystallizes in an o...

Lithium borohydride crystallizes in an orthormobic system with 4 molecules per unit cell. The unit cell dimensions are `a =6.8 Å, b =4.4 Å` and `c= 7.2 Å`. If the molar mass is 21.76, then the density of crystals is:

A

`0.6708g cm^(-2)`

B

`1.6708 g cm^(-3)`

C

`2.6708g cm^(-3)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
1
`d=(ZM)/(a^(3)N_(A))=(4xx21.76)/(6.8xx10^(-8)xx4.4xx10^(-8)xx7.2xx10^(-8)xx6.023xx10^(23))=0.6708gcm^(-2)`
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RESONANCE ENGLISH-SOLID STATE-PHYSICAL CHEMITRY (SOLID STATE)
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  2. Fraction of the total volume occupied by atoms in a simple cube is:

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