4. The covalent bond with the greatest polarity would form in which of the atom

Question

4. The covalent bond with the greatest polarity would form in which of the atom pairs below? A) Br-Br c) C-P 5 5, Use the Born-Haber cycle to calculate the lattice energy of MgO (s) given the following data: AH(sublimation) Mg= 130 kJ/mol 11 (Mg)= 738.1 kJ/mol l: (Mg) 1450 kJ/mol Bond energy (0-0)-498.7 kJ/mol EA (O) 141 kJ/mol EA (0)-780 kJ/mol , (MgO(s))s-601.8 kJ/mol 2200 kJ/mol 2800 kJ/mol 3200 kJ/mol 3800 kJ/mol .4 100 kJ/mol A) B) 6. The total number of valence electrons in the ion NH: is B) 9 C) 10 D) 17 E) 18 7. List all types of bonding present in the molecule SO I ionic bond II. polar covalent bond III. nonpolar covalent bond I only By II only III only D) I and II E) Il and III

Explanation / Answer

4] Covalent bond with the greatest polarity will be a covalent bond between two atoms with the most difference in electronegativity.
In this case between B and O

5] The Born-Haber Cycle can be reduced to a single equation:

Heat of formation= Heat of atomization+ Dissociation energy+ (sum of Ionization energies)+ (sum of Electron affinities)+ Lattice energy

Substituting all values from the given data in the above equation =====>

Actually the given data does not delta H for atomisation of O = 249 KJ / mol

and Electron affinities are given wrong

EA (O) = -141KJ/mol

EA( O-) = 780KJ/mol

Keep these all values

Lattice energy = 3800KJ/mol

3] Nitrogen has 5
Each hydrogen has 1
and you are missing 1 from the + charge (means an e- left)
So you have 5+4-1 = 8

4]Polar covalent bond [since electrons sharing is taken place betwwen O and S and is polar due to electronegativity difference ]

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