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A(2)B molecules(" molar mass " = 259.8 ...

`A_(2)B` molecules`(" molar mass " = 259.8 g//"ml")` crystallises in a hexagonal lattice as shown in figure .The lattic constants were `a=5 Å` and `b=8 Å` . If denstiy of crystal is `5 g//cm^(3)` then how many molecules are contained in given unit cell ? `(" Use" N_(A) = 6xx10^(23))`

(a)6
(b)4
(c)3
(d)2

A

6

B

4

C

3

D

2

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The correct Answer is:
D
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