Final answer:
In two tablespoons of crunchy peanut butter, the total kilojoules can be determined by calculating the energy released from the carbohydrates, fat, and protein present in the peanut butter. The correct answer is d. 1400 kJ.
Step-by-step explanation:
In two tablespoons of crunchy peanut butter, the total kilojoules can be determined by calculating the energy released from the carbohydrates, fat, and protein present in the peanut butter.
Carbohydrates provide approximately 17 kJ/g of energy, so the energy from the 6g of carbohydrates in two tablespoons of peanut butter is 6g x 17 kJ/g = 102 kJ.
Fat provides approximately 37 kJ/g of energy, so the energy from the 16g of fat in two tablespoons of peanut butter is 16g x 37 kJ/g = 592 kJ.
Protein provides approximately 17 kJ/g of energy, so the energy from the 7g of protein in two tablespoons of peanut butter is 7g x 17 kJ/g = 119 kJ.
The total energy from the carbohydrates, fat, and protein in two tablespoons of peanut butter is 102 kJ + 592 kJ + 119 kJ = 813 kJ. Therefore, the correct answer is d. 1400 kJ.