Principles of Modern Chemistry
8th Edition
ISBN: 9781305079113
Author: David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher: Cengage Learning
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The first three absorption lines in the pure rotational spec-
trum of gaseous 12C16O are found to have the frequencies
1.15 x 1011, 2.30 × 1011, and 3.46 × 1011 s-1. Calculate:
(a) The moment of inertia I of CO (in kg m²)
(b) The energies of the J = 1, J = 2, and J = 3 rotational
levels of CO, measured from the J = 0 state (in joules)
(c) The C-O bond length (in angstroms)
The spacing of lines in the microwave spectrum of 27Al1H is 12.604 cm−1; calculate the moment of inertia and bond length of the molecule.
Calculate the vibrational energy of the v = 2 state of 1H127 I relative to the ground state, including the anharmonic corrections.
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- Is the bond length in 1HCl the same as that in 2HCl? The wavenumbers of the J = 1 ← 0 rotational transitions for 1H35Cl and 2H35Cl are 20.8784 and 10.7840 cm–1, respectively. Accurate atomic masses are 1.007 825mu and 2.0140mu for 1H and 2H, respectively. The mass of 35Cl is 34.968 85mu. Based on this information alone, can you conclude that the bond lengths are the same or different in the two molecules?arrow_forward(a) Express the moment of inertia of an octahedral AB6 molecule in terms of its bond lengths and the masses of the B atoms. (b) Calculate the rotational constant of 32S19F6 , for which the S—F bond length is 158 pm.arrow_forwardCalculate the energies of the first four rotational levels of 1H127I free to rotate in three dimensions; use for its moment of inertia I = μR2, with μ = mHmI/(mH + mI) and R = 160 pm. Use integer relative atomic masses for this estimate.arrow_forward
- When ultraviolet radiation of wavelength 400 nm passes through 2.50 mm of a solution of an absorbing substance at a concentration 0.717 mmol dm−3, the transmission is 61.5 per cent. Calculate the molar absorption coefficient of the solute at this wavelength. Express your answer in square centimetres per mole (cm2 mol−1).arrow_forwardCalculate the frequency and wavenumber of the J = 3 ← 2 transition in the pure rotational spectrum of 14N16O. The equilibrium bond length is 115 pm. Would the frequency increase or decrease if centrifugal distortion is considered?arrow_forward3 Calculate the frequencies and wavelengths for the rotational transition J = 0 → J = 1 and J = 4 → J = 5 for the HCl molecule. The internuclear distance is Re = 0.12745 nm. What is the frequency shift between the two isotopomers H35Cl and H37Cl for the two transitions?arrow_forward
- A molecule in a liquid undergoes about 1.0 × 1013 collisions in each second. Suppose that (i) every collision is effective in deactivating the molecule vibrationally and (ii) that one collision in 100 is effective. Calculate the width (in cm−1) of vibrational transitions in the molecule.arrow_forwardConsider the rotational spectrum of a linear molecule at 298 K with a moment of inertia of 1.23×10−461.23\times10^{-46}1.23×10−46 kg m2 . (a) What is the frequency for the transition from J = 2 to J = 3? (b) What is the most populated rotational level for this molecule? Would the transition in (a) give the most intense signal in the rotational spectrum?arrow_forwardQ/ The bond length of the C0O molecule is 112.8 pm. Calculate the following (a) The reduced mass. (b) The rotational constant of CO when moment of inertia (I) is 1.4486 x 1046 kg.m² (c) Calculate the wavelength of the photon absorbed when a CO molecule initially in the J=2 level. makes a transition to the J=3 level.arrow_forward
- Calculate the wavenumber of the first overtone transition w ith v = 2 ~ 0 in nitric oxide. NO. given that the valueof the vibrational wavenumber is v = 1904.03 em·' and theanharmonicity constant is x, = 0.0073.arrow_forwardThe molar absorption coefficient of a solute at 540 nm is 386 dm3 mol−1 cm−1. When light of that wavelength passes through a 5.00 mm cell containing a solution of the solute, 38.5 per cent of the light was absorbed. What is the molar concentration of the solute?arrow_forwardCalculate the energy of the J=0 to J=1 rotational transition of the O₂ molecule with a bond length of 121 pm.arrow_forward
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