5. Since the F-C-F bond angle in the CH2F2 molecule is 108.3 °; a) What is the% s character of the hybrid orbital used in the formation of the C-H bond of the carbon? b) What is the angle between H-C-H?
6. The standard formation enthalpy of (15p) KCl is -571 kJmol-1. Plot the Born-Haber cycle and calculate the electron affinity of chlorine with the help of the data below.
ΔH ° a (K) = 89 kJmol-1 BE (Cl-Cl) = 244 kJmol-1 IE (K) = 425 kJmol-1 ΔHL (KCl) = 719 kJmol-1

7. Draw the MO (molecular orbital) energy diagram for (15p) OF + to calculate the bond degree (8O, 9F).