()
the equation for the reaction can be shown as:
hh
h-c-0-0-h
+ 30=
0
2
0=c=o
+ 3h-o-h
hh
bond
bond energy in
kj per mole
413
347
c-h
c-c
c-o
c=0
o-h
o=0
358
799
467
495
use the bond energies to calculate the overall energy change for this
reaction.
overall energy change =

Explanation:

You calculate the energy required to break all the bonds in the reactants.

Then you subtract the energy needed to break all the bonds in the products.

                             CH₃CH₂OH        +  3O₂ ⟶ 2CO₂ + 3H₂O

Bonds:         5C-H 1C-C 1C-O 1O-H    3O=O     4C=O   6O-H

D/kJ·mol⁻¹:    413    347  358  467       495        799      467