`A_(2)B` molecules`(" molar  mass " = 259.8 g//"ml")` crystallises in a hexagonal  lattice
Channel: Doubtnut
Date: 19/04/2020

`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))`