Question

Answer the following questions given the bonding energy (kJ/mol) data:

I-I:150
F-F:160
C-C:350
H-H:435
(a) Calculate the energy of the I-F bond. Express your answer in units of kJ/mol.
(b) Calculate the % ionic character of the I-F bond.

Answer 1

You have the enthalpies of the I-I bond and the F-F bond, both of which are homonuclear.

To find the heteronuclear bond enthalpy, I-F, you have you use the formula Professor Cima showed in the lecture.

It is the geometric mean of the two homonuclear enthalpies + 96.3(difference of the two electronegativities)^2

The value you get is the correct answer, it is betwen 300 and 350 kJ/mol.

b)
% Ionic Character = 100(1-exp(-(difference in electronegativities)^2/4)))

The value that you get should be between 30% and 35%

Answer 2

what is the answer