Question

A glazed doughnut contains 22 g of carbohydrate, 12 gram of fat, and 2 g of protein. How many kilojoules of energy does the doughnut contain? (The accepted caloric values for foods are 17 kJ/g for carbohydrates, 39 kJ/g for fats, and 17 kJ/g for proteins.) Round the answer to the tens place.

a.860 kJ
b.660 kJ
c.280 kJ
d.200 kJ
e.70 kJ

Answer 1

The total energy content of a glazed doughnut with 22 g of carbohydrates, 12 g of fat, and 2 g of protein is 880 kJ after calculating separately for each macronutrient and summing them up.

Step-by-step explanation:

To calculate the total energy content of a glazed doughnut we must consider the energy contributions from carbohydrates, fats, and proteins separately, using their respective caloric values.

• Carbohydrates: 22 g × 17 kJ/g = 374 kJ
• Fats: 12 g × 39 kJ/g = 468 kJ
• Proteins: 2 g × 17 kJ/g = 34 kJ

Adding these values together gives us a total energy content for the doughnut:

Total energy = 374 kJ + 468 kJ + 34 kJ = 876 kJ

Rounded to the tens place, the answer is 880 kJ.