In a \( \mathrm{HCl} \) molecule, the Cl-atom may be treated to be ...

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In a \( \mathrm{HCl} \) molecule, the Cl-atom may be treated to be of infinite mass and \( \mathrm{H} \)-atom alone oscillating. If the oscillation of \( \mathrm{HCl} \) molecule are of frequency \( 9 \times 10^{13} \mathrm{~s}^{-1} \), find the force constant of the bond between \( \mathrm{H} \) and \( \mathrm{Cl} \) atoms. Given, Avogadro number \( =6.02 \times 10^{26} \mathrm{~kg} \mathrm{~mole}{ }^{-1} \).
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