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Lithium borohydride crystallizes in an o...

Lithium borohydride crystallizes in an orthorhombic system with 4 molecule per unit cell. The unit cell dimensions are `a=6.8Å,b=4.4Å` and `c=7.2Å`. If the molar mass is `21.76`, calculate density of crystal.

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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