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An element 'X' (At. Mass = 40 g mol^(-1)...

An element 'X' (At. Mass = 40 g `mol^(-1)`) having f.c.c structure has unit cell edge length of 400 pm . Calculate the density of 'X' and the number of unit cells in 4 g of 'X' .
`(N_(A) = 6.022 xx 10^(23) mol^(-1))`.

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