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Question

The dipole moment of HBr is 2.60×1030Cm and the interatomic spacing is 1.41A. What is the percent ionic character of HBr?

A
50%
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B
11.5%
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C
4.01%
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D
1.19%
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Solution

The correct option is B 11.5%
Theoretical value of dipole moment of 100% ionic character =e×d

=(1.6×1019C)(1.41×1010m)

=2.26×1029Cm

Observed value of dipole moment

=2.60×1030Cm

Percent ionic character =observed valuetheoretical value×100

=2.60×10302.26×1029×100

=11.5%

Hence, the correct option is B.

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