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=O 498 kJ/mol; C=O 803 kJ/mol; H — O 467 kJ/mol.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )