Formaldehyde according to VSEPR theory has a "trigonal planar" shape.
Assuming the all the angles between the atoms surrounding the central atom to be equal, and bond moments of C single bond H and C double bond O are 0.4 D and 2.3 D respectively.
Calculate the net dipole moment of the molecule. On the basis of electronegativity, O>C>H.
If its resultant dipole moment is n ,
Calculate the value of:
1 more than a 10,000 times the value of
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From the structure of the molecule it is evident that we must calculate the resultant vector formed from 2 CH bond moments inclined at 120 degrees.
Using the parallelogram law of addition of vectors the resultant vector has a magnitude of 0.4 D along the direction of the CO bond.
Adding these vectors gives us net dipole moment or n = 2.3 + 0.4 = 2.7 D
Multiplying n by 10,000 gives us 27000
On dividing by 3, we obtain 9000
Adding 1 to this value we get 9001
Or simply "It's over 9000"