The unit cell edge length of a cubic system is calculated using the density of the crystal. Let ‘*a*’ be the edge length (or primitive) of a cubic unit cell and ‘*ρ*’ be the density of the crystal.

The mass of the unit cell = *ρa*^{3} _____ (2.1)

Let ‘*M*’ be the molecular weight and *N*_{A} be the Avogadro number (i.e., number of molecules per kg mole of the substance) of the crystal.

Then, mass of each molecule =

If each unit cell contains *n* molecules (or lattice points),

Then the mass of unit cell = *n* ____ (2.2)

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