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Compound A(2)B crystallise in hexagonal ...

Compound `A_(2)B` crystallise in hexagonal lattice at low temperature. Unit cell is shown as following figure:

Given:
Density of `A_(2)B=1/4.33gm cm^(-3)`
`N_(A)=6xx10^(23)`
mas of one molecule of `A_(2)B=36` amu
The number of unit cell present in `2.88kg` of `A_(2)B` is

A

20

B

80

C

`1.2xx10^(25)`

D

`4.8xx10^(25)`

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