There is a colllection of crystalline substances in a hexagonal close packing. If the density of matter is 2.6 g//cm^3, what would be the average density of matter in collection ? What fraction of the space is actually unoccupied ?

There is a colllection of crystalline substances in a hexagonal close

1.	There is a colllection of crystalline substances in a hexagonal close packing. If the density of matter is 2.6 g//cm^3, what would be the average density of matter in collection ? What fraction of the space is actually unoccupied ?
Answer» SOLUTION :In HEXAGONAL CLOSE packing , packing efficiency is 74 % `therefore` Density of matter = Packing fraction x Total density =`74/100xx2.6=1.924 "g/cm"^3` % empty SPACE (space unoccupied ) =100-74=26%