PLEASE HELP Bond energies such as those found in Table 4.4 are sometimes found by “working backward” from
heats of reaction. A reaction is carried out, and the heat absorbed or evolved is measured. From this
value and known bond energies, other bond energies can be calculated. For example, the energy
change associated with the combustion of formaldehyde (H 2 CO) is -465 KJ/mol.

H 2 CO (g) + O 2 (g)  CO 2 (g) + H 2 O (g)

a. Use the information in Table 4.4 to calculate the energy of the C=O double bond in
formaldehyde. Show all work.
b. Compare your answer with the C=O bond energy in CO 2 and speculate on why there is a
difference.