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Ice crystallises in hexagonal lattice ha...

Ice crystallises in hexagonal lattice having volume of unit cell is `132times10^(-24)cm^(3)`.If density is 0.92g `cm^(3)`at a given temperature, then number of water molecules per unit cell is

A

1

B

2

C

3

D

4

Text Solution

Verified by Experts

The correct Answer is:
D
`rho=(ZxxM)/(a_3xxN_0)`. The aim is to find Z.
`0.92xx(Zxx18)/((132xx10^(-24))(6.02xx10^23))`
`=(Zxx18)/(132xx6.02xx10^(-1))`
or `Z=(0.92xx132xx6.02xx10^(-1))/18=4.06`
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