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By X-ray diffraction it is found that nickel crystals are face-centred cubic.The edge of the unit cell is $3.52A^{\large\circ}$.The atomic mass of nickel is $58.7$ and its density is $8.94g/cm^3$.Calculate Avogadro's number from the data.

$\begin{array}{1 1}6.023\times 10^{23}\\5.023\times 10^{23}\\4.023\times 10^{23}\\3.023\times 10^{23}\end{array} $

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