Question

1. Dissociation of water takes place in two steps:
H2O H+ OH; AH = + 497.8 kJ
OH →H+O; AH = 428.5 kJ
What is the bond energy of O-H bond?
1) 463.15 kJ mor' 2) 428.5 kJ mor?
.3) 69.3 kJ mor 4) 926.3 kJ mor​

Answer 1

Answer:

Formula for bond energy of O-H bond is:

=H2O à H + OH 497.8KJmol-1

=OH à O + H 428.5 KJ mol-1

= (497.8 + 428.5)

=463.15 KJ mol-1

so option 1 is correct

Answer 2

Answer: 463.14 kj mol^-1

Explanation:

As It's The O ---- H The Bond Nrg must be average of the nrg's given

497.8 + 428.5 / 2 = 463.15 As This Approach Matches The Answer