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- What is the order of decreasing vibrational frequency for C — Cl, C — Br, C — C, C — O and C — H ?4G I 5:53 2.30 O Yo 40 52% KB/s 1. The C-C stretch in allene (H,C-C=CH,) is about 1650 cm'; the C-H stretch is about 3,100 cm". Calculate the corresponding wavelengths (in nm) and energies (in kJ/mol) of these vibrations. () IIDo you expect the fundamental vibrational frequency to be higher for HCl or NaCl? Explain.
- Which of the following statements about vibrational frequencies are true? (There is more than one correct answer.) Choice 1 of 3:A. A vibrational frequency corresponds to an internal movement of a molecule, such as a bond lengthening and shortening. Choice 2 of 3:B. An imaginary frequency corresponds to a molecular movement downhill from a saddle point. Choice 3 of 3:C. All molecular structures have at least one imaginary frequency.Q.1: The force constant of the bond in HCl is (516 N/m). Assuming the value of the force constant does not depend on the mass of the atoms in the molecule, calculate the fundamental vibrational frequency of each of the following: 'HCl. 'H'Cl and ?H*Cl. Q.2: The Interatomic Distance in the HCl Molecule The spacing, A(1 /2) between the lines in the rotational spectrum of HCI(g) is 20cm'.Calculate the distance between the nuclei (the length of the bond) in the HCl molecule.Calculate the number of possible vibrational modes for each of the following molecules and assign frequency ranges to each. i) NH3 ii) C2H4 iii) CCl2F2 iv) CH3CH2OH b) Which of the above molecules will absorb IR radiations most strongly? Explain your answer.
- 5. The fundamental vibrational frequencies for 1H19F and 2D19F are 4138.52 and 2998.25 cm-1, respectively, and De for both molecules is 5.86 eV. What is the difference in the bond energy (bond dissociation energy) of the two molecules? A) 0.567 eV B) 0.15 eV C) 0.0707 eV D) 0.254 eVWhich of the following bonds would you expect to have the largest frequency of vibration? Α) 1Η-1Η Β) 2Η-2Η C) 1H-79Br D) 1H-12C Ε) 12C-16ΟRiboflavin absorbs UV-visible light making the electrons in the molecule more energetic. As a result, the more energetic electrons move from the 'ground state' electronic energy level to higher electronic energy levels known as 'excited states’. Which of the following statements is NOT true regarding how the ‘excited state’ molecule loses energy and returns to the 'ground state'? a) non-radiative losses via bond vibration and rotation within the molecule b) non-radiative losses via phosphorescence c) non-radiative losses via collisions with other molecules d) radiative losses via fluorescence emission of light
- Arrange the following energies in order of increasing magnitude: a) the typical energy of a covalent single bond; b) the mean molecular translational energy for a gas at room temperature; c) the mean rotational energy of a diatomic molecule at room temperature; d) the vibrational energy for a diatomic molecule at room temperature; e) the ionization energy of H. Justify your order.Draw an energy level diagram (E vs. R) featuring a ground electronic state and two excited electronic states, one of which is bonding and one antibonding. Also clearly show vibrational and rotational energy levels. Explain what R is.9) The vibrational frequency of gaseous HCl occurs at 2885 cm¹ in the IR spectrum. What is the energy E, of this radiation in joules? a) 5.73 x 10-20 J b) 8.24 x 10-19 J c) 6.48 x 10-21 J d) 1.80 x 10-19 J