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Calculate the packing efficiency in Face...

Calculate the packing efficiency in Face Centred Cubic (FCC) structure.

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`d=(ZtimesM) /(a^3timesN_A)` Z= No of atoms in FCC lattice = 4 ` 4times63.5/(3.61times10^-8)times(6.02times10^23)` Atomic mass of unit cell= `(4times63.5)/(6.02times10^23)= 4.22times10^-22g`
Density=` ("mass of unit cell")/("vol of unit cell") = (4.22times10^-22)/(47.4times10^-24)=8.9g cm^-3`
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