A copper complex crystallising in a CCP lattice with a cell edge of 0.4518 nm has been revealed by employing X-ray diffraction studies. The density of a copper complex is found to be 7.62 g cm^$$-$$3. The molar mass of copper complex is ____________ g mol^$$-$$1. (Nearest integer)

[Given : N_A = 6.022 $$\times$$ 10²³ mol^$$-$$1]

Diamond has a three dimensional structure of C atoms formed by covalent bonds. The structure of diamond has face centred cubic lattice where 50% of the tetrahedral voids are also occupied by carbon atoms. The number of carbon atoms present per unit cell of diamond is ____________.

KBr is doped with 10^$$-$$5 mole percent of SrBr₂. The number of cationic vacancies in 1g of KBr crystal is ____________ 10¹⁴. (Round off to the Nearest Integer).

[Atomic Mass : K : 39.1 u, Br : 79.9 u N_A = 6.023 $$\times$$ 10²³]

Ga (atomic mass 70 u) crystallizes in a hexagonal close packed structure. The total number of voids in 0.581 g of Ga is __________ $$\times$$ 10²¹. (Round off to the Nearest Integer). [Given : N_A = 6.023 $$\times$$ 10₂₃]