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An element cyrstallises in a structure h...

An element cyrstallises in a structure having a fcc unit cell of and edge 200 pm. Calculate its density if 200 g of this element contains `24xx 10^(23)` atoms.

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`24 × 10^(23)` atom contain by 200g
`6xx10^(23)` atom contains by
`(200)/(4) g`=50g
M=50 `g//mole`
`rho=(4xx(50)/(6xx10^(23)))/(200xx10^(-10))^(3)=(4xx50)/(6xx10^(23)xx8xx10^(-24))`
`(4xx50)/(48xx10)^(-1)=(2000)/(48)`
`rho=41.67 g//cm^(3)`
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