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Covalent Bond vs Ionic Bond

The dipole mo...

Question

The dipole moment of $H B r$ is $2.60 \times 10^{- 30} C . m .$ and the interatomic spacing is $1.41 ˚ A$ . What is the per cent ionic character of $H B r$ ?

11.5

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10.5

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Solution

The correct option is A $11.5$
Theoretical value of dipole moment of a 100% ionic character $= e \times d$
$= (1.60 \times 10^{- 19} C) (1.41 \times 10^{- 10} m)$
$= 2.26 \times 10^{- 29} C m$
observed value of dipole moment $= 2.60 \times 10^{- 30} C m$
per cent ionic character $= \frac{o b s e r v e d v a l u e}{t h e o r e t i c a l v a l u e} \times 100$
$= 2.60 \times \frac{2.60 \times 10^{- 30}}{2.26 \times 10^{- 29}} \times 100 = 11.5$

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