A crystalline solid of a pure substance has a face-centred cubic structure with a cell edge of 400 pm. If the density of

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Q 2987567487.     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 g cm^-3, then the number of atoms present in 256 g of the crystal is N xx 10^24. The value of N is

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