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Iron has a body centred cubic unit cell ...

Iron has a body centred cubic unit cell with the cell dimension of 286.65 pm. Density of iron ·is 7.87 g `cm^(-3)` Use this information to calculate Avogadro's number. (Atomic mass of Fe= 56.0 u)

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In bee, Z = 2 , M =56 g `mol^(-1)` ,d = 7.87 g `cm^(-3)`
`a=286.65xx10^(10)cm`
`d=(ZxxM)/(a^3xxN_A),7.87=(2xx56)/(286.65xx10^(-10))^3xxN_A,N_A=(2xx56)/(18.45xx10^(-23))=6.082xx10^(23)`
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