In a polyatomic molecule (containing more than 2 atoms), every two bonded atoms have their dipole duple moment. This is called the bond moment. This net dipole moment of the polyatomic molecule is the result ant of the different bond moments. Obviously, the resultant will depend upon the directions of the bonds. Thus if a molecule. AB2 contains two A-B bonds at an angle of and 9   0 is the value of each bond moment, then the dipole moment of the molecule will be


As μ is known form experiments, therefore, knowing the value of Ø. the method is usually used for the calculation of bond moments. Alternatively, knowing the value of  μ and μ_AB the method can be used for the calculation of Ø and hence for predicting the shapes of molecules.                              


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