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Question

The observed dipole moment of HBr is 0.79D. Calculate the percentage ionic character of the bond in HBr if bond distance is 1.42 ˙A.

A
16.9%
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B
12.0%
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C
5.0%
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D
20%
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Solution

The correct option is A 12.0%
Ionic character=Observed dipole moment Theoretical dipole moment×100Theoritical dipole moment=(1.6×1019C)×(1.42×1010m)=2.272×1029Cm1D=3.33564×1030CmPercentage ionic character=0.79×3.33564×10302.272×1029×100=12%

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