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Ice crystallises in hexagonal lattice ha...

Ice crystallises in hexagonal lattice having the volume of unit cell as `132xx10^(-24)cm^(3)`. If density is `0.92 g cm^(-3)` at a given temperature, then number of `H_(2)O` molecules per unit cell is

A

1

B

2

C

3

D

4

Text Solution

Verified by Experts

Density , ` d= (Mz)/(N_(0)a^(3))`
where, M = molar mass = 18 g `"mol"^(-1)`
`N_(0)` = Avogadro’s number = `6.022 xx 10^(22)`
Volume =` a^(3)= 132xx10^(-24)cm^(3)`
`:. 0.92 = (18xxz)/(6.02xx10^(23)xx132xx10^(-24))`
`:.` z=4
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