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An element (at. mass = 60) having face c...

An element (at. mass = 60) having face centred cubic unit cell has a density of 6.23g `cm^(-3)`. What is the edge length of the unit cell? (Avogadro's constant = `6.023 xx 10^(23) mol^(-1)`)

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`a^(3)=(Z xx M)/(N_(0)xx rho)=(4xx60)/(6.02xx10^(23)xx6.23)`
a = 400 pm
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