Question

KBr has NaCl type sturcture . Its density is 2.75 g `cm^(-3)` . Edge length of unit cell will be:
(Molar mass of KBr =119 g `"mol"^(-1)`)
A. `3.3xx10^(-8)` cm
B. `6.6 xx 10^(-8)` cm
C. `9.9xx10^(-8)` cm
D. `1.6xx10^(-8)` cm

Answer 1

Correct Answer - B
`a=[(ZM)/(rhoN_(A))]^(1//3)=[(4xx119)/(2.75xx6.023xx10^(23))]^(1//3)=6.6xx10^(-8)` cm