6. C02 is linear molecule. Which statement is true? a No pure rotational spectru

Question

6. C02 is linear molecule. Which statement is true? a No pure rotational spectrum could be observed. CO2 has 3 normal vibrational modes. CO2 has 3 rotationals. CO2 has a permanent dipole moment. A) B) C) D) Within the Born-Oppenheimer approximations, the electronic Hamiltonian for the LiH hasx and y terms for kinetic and potential energies, respectively. A)x-1 and y-4 B) x-2 andy-6 C) x-4 and y-4 D) x-3 and y=5 If the bond length for a diatomic molecule is increased, how will the rotational energy level be changed? A) Increased B) Decreased C) No change 8. D) undefined Pure rotational spectrum and pure vibratioanl spectrum usually appear in, respectively A) Infrared and microwave B) UV and infrared infrared D) Visible and infrared 9. C) microwave and

Explanation / Answer

6. A

Carbon dioxide is highly symmetric polyatomic molecules would not have a permanent dipole moment as the dipoles along the C-O bonds will cancel each other out. Thus, it would not exhibit a pure rotational spectrum.

The degrees of vibrational modes for linear molecules can be calculated using the formula:

3N5, Thus, CO2 has 4 vibrational modes

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