NEET Chemistry The Solid State Questions Solved


Lithium borohydride (LiBH4),crystallises in an orthorhombic system with 4 molecules per unit cell. The unit cell dimensions are : a = 6.81Å, b= 4.43Å, c=7.17Å. If the molar mass of LiBH4 is 21.76 g mol–1. The density of the crystal is –

(1) 0.668 g cm–3

(2) 0.585 g cm2

(3) 1.23 g cm–3

(4) None

(1) We know that, ρ=ZMN0V=4×(21.76gmol1)(6.023×1023mol1)(6.81×4.43×7.17×1024cm3)=0.668gcm3  

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