Question 6.CC.8: Predict whether AsCl3 is polar or nonpolar....
Predict whether AsCl_3 is polar or nonpolar.
Step-by-Step
From its Lewis structure, we see that AsCl_3 has four electron groups with three bonded atoms.
\begin{array}{c}\underset{\cdot\cdot}{\overset{\cdot\cdot}{\text{:Cl:}}}\underset{\cdot\cdot}{\overset{\cdot\cdot}{\text{As:}}}\underset{\cdot\cdot}{\overset{\cdot\cdot}{\text{Cl:}}}\\\underset{\cdot\cdot}{\text{:Cl:}}\end{array}The shape of a molecule of AsCl_3 would be trigonal pyramidal with three polar bonds (As—Cl = 3.0 – 2.0 = 1.0) that do not cancel out. Thus, it is a polar molecule.
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