A frozen TV dinner contains 21 g of protein, 59 g of carbohydrate, and 18 g of fat. What is the total number of kilojoules (kJ) of potential energy within this TV dinner? The accepted values for potential energy are 17 kJ per gram of protein, 17 kJ per gramof carbohydrate, and 38 kJ per gram of fat.
Round your answer to the nearest tens place and with the appropriate units.

2040 kJ

Explanation:

Step 1: Calculate the energy provided by 21 g of protein

17 kJ are provided per gram of protein.

21 g × 17 kJ/g = 357 kJ

Step 2: Calculate the energy provided by 59 g of carbohydrate

17 kJ are provided per gram of carbohydrate.

59 g × 17 kJ/g = 1003 kJ

Step 3: Calculate the energy provided by 18 g of fat

38 kJ are provided per gram of fat.

18 g × 38 kJ/g = 684 kJ

Step 4: Calculate the total energy provided by the dinner

357 kJ + 1003 kJ + 684 kJ = 2044 kJ ≈ 2040 kJ

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