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A face-centred cubic element (atomic mas...

A face-centred cubic element (atomic mass `60`) has a cell edge of `400` pm. What is its density?

Text Solution

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For the face-centred cubic, `Z _(eff) = 4`
`rho = (Z_(eff) xx Aw)/(a^(3) xx N_(A) xx 10^(-30)) g cm^(-3)`
`(4 xx 60)/((400)^(3) xx (6.02 xx 10^(23)) xx 10^(-30)) = 6.23 g cm^(-3)`
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