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Which molecules have diploe moments? Indicate the polarity of each bond and the...

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laurennpaigex3 | (Level 1) eNoter

Posted August 25, 2012 at 7:17 AM via web

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Which molecules have diploe moments? Indicate the polarity of each bond and the direction of the net dipole moment of the molecule.

 

 

Which of the following molecules have diploe moments? For the molecules that are polar, indicate the polarity of each bond and the direction of the net dipole moment of the molecule. (<--- THIS IS THE COMPLETE AND PROPER QUESTION!!)

a.)   CH2Cl2, CHCl3, CCl4

b.)   CO2, N2O

c.)   PH3, NH3

 

I would really appreciate help and provided answers to this problem!!! It IS urgent. Thanks so much,!

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llltkl | College Teacher | (Level 3) Valedictorian

Posted November 4, 2012 at 6:21 AM (Answer #1)

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Among these molecules CCl4 and CO2 are non polar, rest are polar and should have a dipole moment. Polarity of bonds in each case will be towards the more electronegative atom, i.e. the negative end towards it. Direction of the net dipole moment of the molecule can be obtained by a vector summation (resultant) of all these individual bond moments as follows:

Molecule ->direction of bond moment -> net dipole moment of the molecule

 CH2Cl2 -> C- to Cl, and H- to C -> towards the middle point of the line joining the two chlorine atoms

CHCl3-> C- to Cl, and H- to C -> towards the centre of gravity of the triangle obtained by joining the three chlorine atoms

CCl4 -> C- to Cl -> zero (the vectors cancel out mutually)

CO2 -> C- to O -> zero (the vectors cancel out mutually)

N2O-> N- to O ->N- to O-, through the central N-

PH3 -> H- to P -> the direction of the dipole created by the phosphorous lone pair

NH3 -> H- to N -> the direction of the dipole created by the nitrogen lone pair.

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