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Lithium borohydride crystallizes in an o...

Lithium borohydride crystallizes in an orthorhombic system with 4 molecules per unit cell. The unit cell dimensions are `a=6.8A^(@),b=4.4A^(@)andc=7.2A^(@)`. If the molar mass is 21.76, calculate the density of crystal.

A

`0.671gcm^(-3)`

B

`6.71gcm^(-3)`

C

`6.71xx10^(-3)gcm^(-3)`

D

`6.71xx10^(-4)gcm^(-3)`

Text Solution

Verified by Experts

The correct Answer is:
A
`d=(zxxM)/(a^(3)N_(A))=(4xx21.76)/(6.8xx10^(-8)xx4.4xx10^(-8)xx7.2xx10^(-8)xx6.02xx10^(23))=0.6709gcm^(-3)`
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