Q9 of 50 Page 1

Explain how you can determine the atomic mass of an unknown metal if you know its mass density and the dimensions of unit cell of its crystal.

Mass of an atom present in the unit cell is calculated by:-


m = where m is the Molar mass.


Therefore, density (d) of the unit cell =


Now, we can calculate


d =


Here, z is the number of atoms in unit cell.


NA is Avagadro’s number.


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