Which of the following molecules exhibit rotational and or vibrational spectra
H2, HF, CO, NO
Numerical analysis of ro-vibrational spectral data would appear to be complicated by the fact that the wavenumber for each transition depends on two rotational constants, {\displaystyle B^{\prime \prime }} B^{{\prime \prime }} and {\displaystyle B^{\prime }} B^{\prime }. However combinations which depend on only one rotational constant are found by subtracting wavenumbers of pairs of lines (one in the P-branch and one in the R-branch) which have either the same lower level or the same upper level.[2][3] For example, in a diatomic molecule the line denoted P(J + 1) is due to the transition (v = 0, J + 1) → (v = 1, J), and the line R(J
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Normal water contains isotope of hydrogen 3H, tritium. It has a half-life of 12.3 years.
Determine the age of a bottle of wine whose 3H radiations is about 1/10 that present in new wine.
Given that the spacing of the lines in the microwave spectrum of 24Al1H is constant at
12.604 cm-1. Calculate the moment of inertia and bond length of the molecule.
Arrive at the Lewis structure of XeF4 using the steps given in Unit 3.
Derive an expression for calculating energy values corresponding n = 3 for a particle in one dimensional box.
From the infrared spectrum given below, identify the possible functional groups corresponding to the peaks indicated in the arrows.
Calculate the lattice energy (in Units kJ mol-1) for ZnO crystal using Eq. 3.4 based on electrostatic model and using a Born-Haber cycle. Compare the two answers and comment on any difference.
Useful data:
Medelung constant (A) = 1.6411
Born Constant (n) = 8
Internuclear distance (a) = 199 pm
Zn(s) + ½ O2(g) → ZnO(s) ∆Hf = - 350.5 kJ mol-1
Zn(s) → Zn(g) ∆HS = 130.4 kJ mol-1
Zn(g) → Zn+(g) I(Zn) = 906.3 kJ mol-1
Zn+(s) → Zn2+(g) I(Zn+) = 1733 kJ mol-1
½ O2(g) → O(g) ½ ∆Hd = 248.5 kJ mol-1
O(g) → O- (g) EA(O) = 141 kJ mol-1
O-(g) → O2-(g) EA(O-) = - 780 kJ mol-1
Explain the reason for the variation of the first ionization energies of the third period elements.