Question

Calculate the number of kJ for the 4,500,000 calories burned.

A. 18,800 kJ
B. 14,340 kJ
C. 18,828 kJ
D. 16,740 kJ

Answer 1

To convert 4,500,000 calories to kilojoules, multiply the calories by the conversion factor (1 cal = 4.184 J) to get joules, then divide by 1000 to convert joules to kilojoules, resulting in 18,828 kJ.

Step-by-step explanation:

To calculate the number of kilojoules (kJ) for the 4,500,000 calories burned, we will use the conversion factor that 1 cal = 4.184 J. First, we convert the calories to joules, and then we convert joules to kilojoules.

Here is the step-by-step calculation:

1. Convert calories to joules: 4,500,000 cal × 4.184 J/cal = 18,828,000 J.
2. Convert joules to kilojoules: 18,828,000 J / 1000 = 18,828 kJ.

Therefore, the correct option is C. 18,828 kJ.