The energy of the C-C bond is 347 kJ/mol, and that of the Cl-Cl bond is 243 kJ/mol. Which of the following values might you expect for the C-Cl bond energy? Explain.
A) 590 kJ/mol (sum of the values given)
B) 104 kJ/mol (difference of the values given)
C) 295 kJ/mol (average of the values given)
D) 339 kJ/mol (greater than the average of the values given)

Both C-C and Cl-Cl bond are non-polar chemical bonds that satisfy the octet rule, for that reason are strong bonds. Carbon can form 3 additional bonds giving an additional bond strength.

The C-Cl bond is a bond that satisfy octet rule but is a polar bond that gives an additional strength bond. For that reason it is possible to expect for the C-Cl bond energy:

D) 339 kJ/mol (greater than the average of the values given)

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fichoh fichoh · Answer 2 · 2021-11-03T23:13:01+01:00

The type of bond between C-Cl is called an heteronuclear bond as it is formed between two different atoms ; carbon and chlorine. Hence, the bond energy is 339 kJ/mol (greater than the average of the values given)

The bond energy in an heteronuclear bond is usually greater than the mean of the two independent bonds formed by the same atoms.

That is ; the sum of the C-C and Cl-Cl atoms ; these are called homonuclear bonds.

Hence,

C-C = 347 kj/mol
Cl-Cl = 243 kJ/mol

Average = (347 + 243) / 2 =295 kJ/mol

Hence, the bond energy should be greater than 295 kJ/mol

Therefore, the correct option is D ; 339 kJ/mol (greater than the average of the values given)

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