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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.

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`"0.67 g cm"^(-3)`
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