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A compound A^(+)B^(-) has rock salt type...

A compound `A^(+)B^(-)` has rock salt type structure. The formula mass of Ab is 6.023 y amu and the closest approach distance of `A^(+)B^(-)` in the crystal is `y^(1//3)` nm. What is the density of the lattice in `Kg//m^(3)`?

A

5

B

7

C

9

D

11

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