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Silver crystallises in face-centred cubi...

Silver crystallises in face-centred cubic lattice. If edge length of the unit cell is `4.07xx10^(-8)cm` and density of silver is `10.48g*cm^(-3)`, determine the relative atomic mass of silver.
or, (i) What is Schottky defect? (ii) Find out packing efficiency in a simple cubic lattice.

Text Solution

Verified by Experts

We have the relation: `M=(rhoxxNxxa^(3))/Z`
The information given are:
`rho=10.48g*cm^(-3),a=4.07xx10^(-8)cm`
For fcc lattice, Z = 4. Putting all these values into the above relation gives-
`M=(10.48xx6.022xx10^(23)xx(4.07xx10^(-8))^(3))/4g*mol^(-1)`
`=106.4g*mol^(-1)`
Therefore, the relative mass of silver = 106.4
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