Question

Need help, I am confused. Please explain how you get the answer.

A chemist burns a serving of peanuts in a calorimeter ands sees that 150,000 J of energy is released. What should the information on the nutritional label say? (1 Calorie = 1,000 calories; 1 calorie = 4.186 J)

A. 35.8 Calories
B. 3,580 J
C. 3,580 Calories
D. 35.8 calories

Answer 1

Answer is: the information on the nutritional label should say A. 35.8 Calories.

Q = 150000 J; released energy.

Step 1: convert Jules in calories:

Q = 150000 J ÷ 4.186 J/calorie.

Q = 35833.73 calorie.

Step 2: convert calories in Calorie:

Q = 35833.73 calorie ÷ 1000 calorie/Calorie.

Q = 35.83 Calorie.