Use bond energies to determine which halogen produces the most exothermic halogenation reaction with ethene. the c-f, c-br, and c-i bond energies are 552 kj/mol, 280 kj/mol, and 209 kj/mol, respectively.

Question

Hassan Branch

Chemistry

3 March, 14:59

Use bond energies to determine which halogen produces the most exothermic halogenation reaction with ethene. the c-f, c-br, and c-i bond energies are 552 kj/mol, 280 kj/mol, and 209 kj/mol, respectively.

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Answers (1)

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Axel Tate · Answer 1

To know the total energy you must know that bond-breaking is endothermic (+) while bondbond-forming is exothermic (-). The bond energy of ethene is 602 kJ/mol. Since we break the ethene, that would be - 602 kJ/mol.

For C-F: - 602 + 552 = - 50 kJ/mol

For C-Br: - 602 + 280 = - 322 kJ/mol

For C-I: - 602 + 209 = - 393 kJ/mol

Since the most negative, hence exothermic, answer is C-I, the answer is C-I.