There is a collection of crystalline substances in a hexagonal close packing. If the density of matter is2.6 g//cm^(3), what would be the average density of matter in colleciton ? What fractionofthe space is actually unoccupied ?

There is a collection of crystalline substances in a hexagonal close p

1.	There is a collection of crystalline substances in a hexagonal close packing. If the density of matter is2.6 g//cm^(3), what would be the average density of matter in colleciton ? What fractionofthe space is actually unoccupied ?
Answer» Solution :In hexagonal CLOSE packing, packingefficiency is 74 % Density of matter= Packing FRACTION ` xx ` TOTAL density = ` 74/100 xx 2.6 = 1.924 " g/cm"^(3)` % EMPTY space ( space unoccupied )= 100 - 74 = 26% .