A crystalline solid of substance|Chemistry|JEE Advance2017

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Paper-1 2017

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A crystalline solid of a pure substance has a face-centred cubic structure with a cell edge of 400 pm . If the density of the substance in the crystal is $8 \mathrm{~g} \mathrm{~cm}^{-3}$, then the number of atoms present in 256 g of the crystal in $\mathrm{N} \times 10^{24}$. The value of N is

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