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Sia

15240672380's Question
Chemistry
Posted 8 months ago

Of the two compounds NOF and NO2 F\mathrm{NO}_{2} \mathrm{~F}, one has μ=\mu= 1.81D1.81 \mathrm{D} and the other has μ=0.47D\mu=0.47 \mathrm{D}. Which dipole moment do you predict for each compound? Explain
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Answer from Sia
Posted 8 months ago
Solution
1
Analyze Molecular Geometry: The molecular geometry of a compound affects its dipole moment. Linear molecules or symmetrical shapes generally have a smaller dipole moment because the individual bond dipoles cancel out
2
Predict Geometry for NOF: The molecule NOF has a bent geometry due to the presence of a lone pair on the nitrogen atom, which leads to a significant dipole moment as the bond dipoles do not cancel out completely
3
Predict Geometry for $\mathrm{NO_2F}$: The molecule NO2F\mathrm{NO_2F} is trigonal planar with respect to the nitrogen atom. The bond dipoles from the two NO\mathrm{N-O} bonds are in opposite directions and of equal magnitude, thus they partially cancel each other out. The bond dipole from the NF\mathrm{N-F} bond does not completely cancel out the remaining dipole, resulting in a smaller dipole moment than NOF
4
Assign Dipole Moments: Based on the predicted geometries, NOF, with its bent geometry, should have the larger dipole moment of 1.81D1.81 \mathrm{D}, and NO2F\mathrm{NO_2F}, with a more symmetrical geometry, should have the smaller dipole moment of 0.47D0.47 \mathrm{D}
Answer
NOF has a dipole moment of 1.81D1.81 \mathrm{D} and NO2F\mathrm{NO_2F} has a dipole moment of 0.47D0.47 \mathrm{D}.
Key Concept
Molecular geometry and symmetry determine the dipole moment of a molecule.
Explanation
NOF has a bent geometry leading to a larger dipole moment, while NO2F\mathrm{NO_2F} has a more symmetrical geometry resulting in a smaller dipole moment.

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