Polarity of AX5 molecule

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Polarity of AX5 molecule

Postby 704578485 » Sun Nov 01, 2015 5:59 pm

I am currently doing practice problems for the upcoming midterm and started doing Question 7 on the 2009 midterm. I got that AsCl5 has a VSEPR formula of AX5. I would have guessed this would have been a polar molecule but the answer key states it is nonpolar. Any explanation of why?

nickgonzalez 1j
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Joined: Fri Sep 25, 2015 3:00 am

Re: Polarity of AX5 molecule

Postby nickgonzalez 1j » Sun Nov 01, 2015 6:29 pm

A molecule with a formula of AX5 would have a trigonal bipyramidal shape. The reason this is nonpolar is because the three atoms on the plane are all equidistant from each other(120 degrees) therefore those three all cancel out. In addition to these, the other two atoms that are not in the plane are 180 degrees apart and therefore cancel each other out as they would be pulling in opposite directions. The fact that there are only Chlorine atoms surrounding the central atom also contributes to as to why it is nonpolar since they all have the same charge.

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