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Question 12 (4 points) Use the equation to help you calculate the heat of combustion of ethylene, C2H4. The bond energies are: C-H 416 kJ/mol; C-C 356 kJ/mol; C=C 598 kJ/mol; O=0 498 kJ/mol; C=0 803 kJ/mol; H-O 467 kJ/mol. 39-0 - 20=C=0+ 22% H The heat of combustion of ethylene is +220 kJ/mol. +1216 kJ/mol. O -754 kJ/mol. -1324 kJ/mol. Question 13 (4 points) Which of the following is not a drawback of using coal for energy production? O Mountaintop mining Mercury in fly ash O Mining explosions Difficult transportation due to instability