Final answer:
A 150-lb person who burns 2700 Calories running a marathon will burn approximately 11300 kilojoules (kJ) of energy, using the conversion factor where 1 Calorie equals 4.184 kJ.
Step-by-step explanation:
A 150-lb person burns about 2700 Calories to run a marathon. To convert this energy into kilojoules (kJ), we use the conversion factor 1 Calorie = 4.184 kJ. Therefore, the energy burned in kJ can be calculated as:
Energy in kJ = 2700 Calories × 4.184 kJ/Calorie
Energy in kJ = 11300 kJ (rounded to the nearest hundred)
So, a 150-lb person will burn approximately 11300 kJ of energy when running a marathon.