UV-VIS absorption spectra are broad band spectra. Explain.
The visible region of the spectrum comprises photon energies of 36 to 72 kcal/mole, and the near ultraviolet region, out to 200 nm, extends this energy range to 143 kcal/mole. Ultraviolet radiation having wavelengths less than 200 nm is difficult to handle, and is seldom used as a routine tool for structural analysis.
The energies noted above are sufficient to promote or excite a molecular electron to a higher energy orbital. Consequently, absorption spectroscopy carried out in this region is sometimes called "electronic spectroscopy". A diagram showing the various kinds of electronic excitation that may occur in organic molecules is shown on the left. Of the six transitions outlined, only
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What is the predicted magnetic moment of Cu+ and Cu2+ ions in mB Unit (Atomic number of Cu 29)?
Which of the following molecules exhibit rotational and or vibrational spectra
H2, HF, CO, NO
Describe the common features which can be explained by the theoretical model of Bohr? Briefly write the limitation of this model.
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
Calculate the number of normal modes of vibration for the following compounds:
- H2O
- CH4
- HBr
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.
From the infrared spectrum given below, identify the possible functional groups corresponding to the peaks indicated in the arrows.
