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C (i): What do you understand by bond energy term
The bond energy term, or average bond enthalpy, is the average amount of energy required to break one mole of a specific type of bond in a gaseous molecule. It is an average value because the energy of a particular bond can vary slightly depending on the molecule it is in.

C (ii): Calculate the C-H and C-C bond energies
The problem provides atomization enthalpies for $\text{C}_2\text{H}_4$ (ethene) and $\text{C}_3\text{H}_8$ (propane). To calculate the C-H and C-C single bond energies,