Une seule des trois molécules CO2, CS2 et COS possède un moment dipolaire moléculaire non nul. L

step 1 So here we've got three molecules and they do have similarities. So we've got CO2. We have CS2 a

Une seule des trois molécules CO2, CS2 et COS possède un...

Une seule des trois molécules $\mathrm{CO}_2, \mathrm{CS}_2$ et $\mathrm{COS}$ possède un moment dipolaire moléculaire non nul. Laquelle est-ce? Pourquoi? Quel est le sens de son moment dipolaire?

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Key Concepts

Molecular Dipole Moment

The molecular dipole moment is a vector quantity that arises from the separation of positive and negative charges within a molecule. It is determined by both the magnitude of the individual bond dipoles and their spatial arrangement. A molecule will have a nonzero dipole moment if the individual dipoles do not cancel out as a result of the molecule's geometry.

Molecular Geometry and Symmetry

Molecular geometry refers to the three-dimensional arrangement of atoms in a molecule. Symmetry plays a crucial role in determining whether a molecule has a net dipole moment; in highly symmetric molecules, the individual bond dipoles cancel each other out, resulting in no overall dipole moment. When the geometry is asymmetric, the bond dipoles can add up, creating a net dipole moment.

Electronegativity and Bond Polarity

Electronegativity is a measure of an atom's ability to attract electrons in a chemical bond. A bond between atoms with differing electronegativities becomes polar, with the more electronegative atom acquiring a partial negative charge, and the other a partial positive charge. This difference in charge distribution contributes to the overall molecular dipole moment if the molecular structure does not allow for cancelation.

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