unit cell and crystal lattice

How are unit cell and space lattice related ?

The edge length of the unit cell of NaCl crystal lattice is 5.623Å , density is 2.16g cm^(-3) and the molar mass of NaCl is 58.5 g " mol "^(-1) . The number of moles per unit cell is

The unit cell of a NaCl lattice :

For unit cell of a NaCI lattice

Distinguish between crystal lattice and unit cell.

The number of atoms per unit cell in bcc lattice is