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Lithium borohydride (LiBH_(4)), crystallises in an orthorhombic system with 4 molecules p er unit cell. The unit cell dimensions are : a = 6.81 Å, b = 4.43 Å , c = 717 Å. If the molar mass of LiBH_(4) is 21.76 g mol^(–1) . The density of the crystal is- (A) .668 g cm–3 (B) .585 g cm^(–3)(C) 1.23 g cm^(–3)(D) None |
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Answer» Solution : (A) We know that, `rho=(ZM)/(NV)` :where V`axxbxxc` `(4XX(21.76 GMO^(-1)))/((6.023xx10^(23)MOL^(-1))xx(6.81xx4.43xx7.17xx10^(-24) cm^(3))` 0.668 `cm^(-3)` |
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