Gas phase bond length and dipole moment of a compound (MX) is 3 Å and 10.8 D, respectively. The ionic character in gas phase MX is

Q. Gas phase bond length and dipole moment of a compound (MX) is 3 Å and 10.8 D, respectively. The ionic character in gas phase MX is _________________%. (Round off to one decimal place)

(1D = 3.336 × 10^–30 C m)

Solution:

To determine the Ionic character of a given compound, Dipole moment is necessary to know the polarity of the compound.

µ = q x r.

Calculation:-

µ = q x r 

⇒ q = 1.6 x 10-19 C, r = 3 x 10-10 m,

thus µ = q x r  = 1.6 x 10-19 x 3 x 10-10 = 4.8 x 10-29. 

In standard unit of µ =  4.8 x 10-29/ 3.336 x 10-30 = 1.43 x 10 1 = 14.3 D.

Percentage of Ionic character is calculated by Ionic character = Expected Value / Theoratical Value x 100

⇒ 10.8 D / 14.3 D x 100 = 75.5 percent.