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Volume of block = 8cm3. The density of Al is 2.7 g/cm3

Density = mass/volume

Mass=Density*Volume

Mass= 21.6g

21.6g Al *(1mole/26.98g) = .8 moles Al

.8moles*(6.022*1023atoms/mole) = 4.82*1023 atoms

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