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The density of apure substance 'A' who...

The density of apure substance 'A' whose atoms are in cubic close pack arragement is `1 g//c c`. If the all the tetrahedral voids are occupied by 'B' atom , What is the density of resulting solid in `g//c c`.[ "Atomic mass" =`(A)= 30 g//"mol"` and atomic mass `(B)= 50 g//"mol"`]

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