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 × 10²⁴. The value of N is ________.
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Density (d) is given by Z x m/a³ x Na
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