The bond length of HCl molecule is 1.275 $\stackrel{\mathrm{o}}{\mathrm{A}}$ and its dipole moment is 1.03 D. The ionic character of the molecule (in per cent) ( charge of the electron=4.8×10^-10  esu) is

Given,
observed dipole moment = 1.03 D
Bond length of HCl molecule, d = 1.275 $\stackrel{\mathrm{o}}{\mathrm{A}}$   = 1.275 ×10^-8  cm 
Charge of electron, e^-=4.8×10^-10  esu
Percentage ionic character = ?
Theoretical value of dipole moment = e×d
                           =4.8×10^-10×1.275×10^-8  esu.cm
                           =6.12×10^-18  esu.cm   = 6.12 D
Percentage ionic character