Gce Model Questions Vol1 2018 Chemistry Question 2
Practice objective / multiple choice question 2 from the 2018 Gce Model Questions Vol1 Chemistry examination.
Diatomic molecule AB has a bond length of 120 pm and an infrared absorption at \(1000\ \text{cm}^{-1}\). The atomic masses are \(M_A = 12\) u and \(M_B = 16\) u. Using the harmonic oscillator model, the force constant \(k\) is given by \[k = (2\pi c \tilde{\nu})^{2}\mu,\] where \(c = 2.998\times10^{10}\ \text{cm s}^{-1}\), \(\tilde{\nu}\) is the wavenumber, and \(\mu\) is the reduced mass in kilograms. (a) Calculate \(k\) for AB (express your answer in N m\(^{-1}\) to two significant figures). (b) A related molecule CD has a measured force constant of \(5.0\times10^{2}\ \text{N m}^{-1}\). Which molecule is expected to have the higher bond order, AB or CD? Justify your answer.
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About This Question
This is Gce Model Questions Vol1 2018 Chemistry Question 2. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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