The dipole moment of HBr is 1.6  ×  10−30  cm and interatomic spacing is 1Ao. The % ionic character of HBr is

Charge  of  e− =1.6  ×  10−19Dipole  moment  of  HBr= 1.6  ×  10−30Inter atomic  spacing = 1Ao = 1 ×  10−10 m%  of  ionic  character  inHBr =dipole  moment  of  HBr ×  100inter  spacing  distance  ×q=1.6  ×  10−301.6  ×  10−19 ×  10−10 ×  100=10−30  ×    1029 ×  100  ×  10−1 ×  100=0.1 ×  100 =10%