# Problem: Bond Energy: C=C is 602 kJ/mol; C-H is 413 kJ/mol; O-H is 463 kJ/mol, O=O is 498 kJ/mol; C=O is 799 kJ/mol. For the combustion reaction of ethylene (C2H4) C2H4 + 3 O2 → 2 CO2 + 2 H2O assume all reactants and products are gases, and calculate the ∆H 0rxn using bond energies. 1. −251 kJ/mol 2. −680 kJ/mol 3. 1300 kJ/mol 4. 680 kJ/mol 5. 0 kJ/mol 6. −1300 kJ/mol  7. 251 kJ/mol

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Bond Energy: C=C is 602 kJ/mol; C-H is 413 kJ/mol; O-H is 463 kJ/mol, O=O is 498 kJ/mol; C=O is 799 kJ/mol. For the combustion reaction of ethylene (C2H4)

C2H4 + 3 O2 → 2 CO2 + 2 H2O

assume all reactants and products are gases, and calculate the ∆H 0rxn using bond energies.

1. −251 kJ/mol

2. −680 kJ/mol

3. 1300 kJ/mol

4. 680 kJ/mol

5. 0 kJ/mol

6. −1300 kJ/mol

7. 251 kJ/mol

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