The dipole moment of HBr is 2.60 ´ 10-30 C m and interatomic distance 141 pm. What is the percentage ionic character of HBr?
HBr is an ionic compound in which H has + 1 and Br has -1 ion
e.g charge one each have
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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
Draw all of the stereoisomers of 2,3-butandiol, label meso compounds and pairs of enantiomer.
Describe the common features which can be explained by the theoretical model of Bohr? Briefly write the limitation of this model.
Write the values of four quantum numbers for 3d electrons.
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.
