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

A crystalline solid of a pure substance has a face-centred cubic structure with a cell edge of 400pm. If the density of the substance in the crystal is 8g cm-3, then the number of atoms present in 256g of the crystal is N × 1024. The value of N is.

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