Question

Resultant dipole moment of h2o is 1.85



d. ignoring effect of l.p calculate dipole moment of o-h bond given bond angle 104degree

Answer 1

Even though the total charge on a molecule is zero, the nature of chemical bonds issuch that the positive and negative charges do not completely overlap in most molecules. Such molecules are said to be polar becausethey possess a permanentdipole moment. A good example is the dipole momentof the water molecule.

Answer 2

: 1.51 D

Let the dipole moment of OH bond be 'x'

Given , Teta=104°

We know,

R^2=P^2+Q^2+2PQcos teta

(1.85)^2=x^2+x^2+2x^2(-1/4)

(cos 104°= -1/4)

(1.85)^2=2x^2- x^2/2

(1.85)^2=3x^2/2

x=1.51 D