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 AgCl has the same structure as that of NaCl. The edge length of unit cell of AgCl is found to be 555 pm and the density of AgCl is 5.561 g cm–3. Find the percentage of sites that are unoccupied. 

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 a = 555 pm

NaCl in FCC = Na4 Cl4

95 x 10–23 = mass of unit cell

95.06 x 10–23 = mass of unit cell

Mass of unit cell (theoretical)

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