Question

How do you know if a molecule has a zero dipole moment?

Answer 1

Answer:

given

Explanation:

if a molecule has zero dipole moment then the molecule is non polar molecule.

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Answer 2

Answer:

Zero dipole moment means that the compound has no net electron displacement between its atoms.

If the molecule has zero dipole moment, then the molecule is non - polar.

Dipole moment is a vector quantity.

For example, these compounds have zero dipole moment.

• $C{Cl}_{4}$
• $C{O}_{2}$
• $Be{Cl}_{2}$
• $B{F}_{3}$ etc.

Dipole moment of compound having regular geometry and same type of atoms is zero. 

The vectorial addition for the dipole moment of the three bonds gives a net sum of zero.

This is possible because the resultant for any two dipole moments is equal and opposite to the third. 

So, to find the net dipole moment in any compound, just find the net resultant of all vectors.