Question

Determine the total kilojoules in two tablespoons of crunchy peanut butter that contains 2 g of carbohydrate, 15 g of fat, and 9 g of protein.

Answer 1

The correct answer is -749.437 Kilojoules

Step-by-step explanation:

In the case of nutrition, Kcal and cal are equal and each macromolecule produces a specific amount of energy in terms of calories. Carbohydrates and protein generate 4 kcal whereas fat generates 9 kcal per gram.

1 g of carbohydrate = 4 kcal

so, 2 gram of carbohydrate = 8 kcal

9 g of protein = 9*4

= 36 kcal

15 g of fat = 15*9

= 135 kcal

in total = 135 + 36 + 8 kcal

= 179 kcal

and, one kcal = 4.186798 kJ

so 179 kcal = 4.186798 * 179

= 749.437 Kilojoules