Number of unit cells in 4g of X(atomic mass=40). Which crystallises in bcc pattern in `(N_(0)="Avogadro number")`

Number of unit cell in 8 g of X (atomic mass =40) which crystallizes in bcc pattern is (N_(A) = Agogardro number)

Number of unit in 4g of an element, (atomic mass= 40) which crystalises bcc pattern is -

The number of unit cells in 8 gm of an element X( atomic mass 40 ) which crystallizes in bcc pattern in ( N_(A) is the Avogadro number)

The total number of unit cell in 78g of potassium if it crystallizes in bcc lattice is

What is the number of unit cells in 6.4g of X (atomic mass = 64) (X crystallises in body centred cubic-lattice)