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An element crystallizes in a structure h...

An element crystallizes in a structure having fcc unit cell of edge 300 pm. Calculate its density if 180 g of this element contain `3.708xx10^(24)` atoms.

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Z (f.c.c. lattice) = 4, a = 300 pm
`=3xx10^(-8)"cm",m=180g`
`n=3.708xx10^(24)d=?`
`d=(Zxxm)/(a^(3)xxn)`
`=(4xx180g)/((3xx10^(-8))^(3)"cm"^(3)xx3.708xx10^(23))`
`=720/(27xx3.708)=7.19"g cm"^(3)`
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BETTER CHOICE PUBLICATION-THE SOLID STATE-Numerical Problems
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  16. An element has a body-centred cubic (bbc) structure with a cell edge o...

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