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There is a collection of crystalline substances in a hexagonal close packing. If the density of matter is ` 2.6 g//cm^(3)`, what would be the average

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There is a collection 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 colleciton ? What fractionofthe space is actually unoccupied ?
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In hexagonal close packing, packing efficiency 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% .
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