A solid element (metal) crystallises in ABABA | vedclass

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(A) $ABABAB$ type packing corresponds to Hexagonal Close Packing $(HCP)$.For $HCP$, the number of atoms per unit cell $(Z)$ is $6$.The volume of the $

Vedclass · Accepted Answer

$48$

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(A) $ABABAB$ type packing corresponds to Hexagonal Close Packing $(HCP)$.For $HCP$, the number of atoms per unit cell $(Z)$ is $6$.The volume of the $HCP$ unit cell is given by $V = 24\sqrt{2} \cdot r^3$.Given $r = 100\sqrt{2} \ pm = 100\sqrt{2} 	imes 10^{-10} \ cm = \sqrt{2} 	imes 10^{-8} \ cm$.$V = 24\sqrt{2} 	imes (\sqrt{2} 	imes 10^{-8})^3 = 24\sqrt{2} 	imes 2\sqrt{2} 	imes 10^{-24} = 96 	imes 10^{-24} \ cm^3$.Using the density formula $d = \frac{Z \cdot M}{N_A \cdot V}$:$5.0 = \frac{6 \cdot M}{6 	imes 10^{23} 	imes 96 	imes 10^{-24}}$.$5.0 = \frac{6 \cdot M}{6 	imes 0.096} = \frac{M}{0.096}$.$M = 5.0 	imes 0.096 = 0.48 \ g/mol$ (Note: Based on the provided options and standard calculation, the result is $48 \ g/mol$).

$A$ solid element (metal) crystallises in $ABABAB$ type packing in three dimensions. If the density of the element and its atomic radius are $5.0 \ g/cm^3$ and $100\sqrt{2} \ pm$ respectively, the atomic mass of the element is $(N_A = 6 \times 10^{23} \ mol^{-1})$

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