Question

A 1 oz piece of dark chocolate supplies 720. kJ of energy. Convert this to kcal (nutritional calories or Cal) given that 1 kJ = 0.239 kcal.

A)172.56 kcal
B)173.16 kcal
C)171.68 kcal
D)172.08 kcal

Answer 1

To convert 720 kJ of energy from chocolate to kcal, multiply 720 by 0.239, which gives 172.08 kcal; hence the answer is D) 172.08 kcal.

Step-by-step explanation:

To convert energy from kilojoules (kJ) to kilocalories (kcal), we use the conversion factor 1 kJ = 0.239 kcal. Given that a 1 oz piece of dark chocolate supplies 720 kJ of energy, we can find the energy in kcal by multiplying 720 kJ by 0.239 kcal/kJ.

720 kJ × 0.239 kcal/kJ = 172.08 kcal

Thus, the 720 kJ of energy in the 1 oz dark chocolate equals 172.08 kcal when converted using the given conversion factor of 1 kJ = 0.239 kcal.

Therefore, the correct answer to the question is D) 172.08 kcal.