Polarity of NH3 and NF3 have the right to be explained on the communication of dipole moments. Dipole minute of NH3 is higher than NF3 molecule.
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The dipole moment of NH3 ( 4.90 × 10–30 Cm) is better than that of NF3 (0.8 × 10–30 Cm).
This is because, in instance of NH3 the orbit dipole due to lone pair is in the very same direction together the resultant dipole minute of the N – H bonds, conversely, in NF3 the orbit dipole because of lone pair that nitrogen is in the direction opposite come the resultant dipole moment of the three N–F bonds. The orbit dipole because of lone pair to reduce the result of the result N – F bond moments, which results in the low dipole minute of NF3.
Also, there is a greater distinction in electronegativity between nitrogen and hydrogen than there is in between nitrogen and fluorine.
The lone pair contribution in ammonia reinforces the dipole conversely, in NF3 the link dipoles oppose the effect of the lone pair.
Answered by | third Mar, 2014, 10:44: AM
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