Determine the grams of protein in a small potato that has a total of 84.0 kcal, and contains 20.0 grams of carbohydrates and no fat.

The total energy content in the potato = 84.0 Kcal

Amount of carbohydrate present in the potato = 20.0 g

Energy value of carbohydrate = 4 kcal/gram

Energy value of protein = 4 kcal/gram

Now the energy contribution from 20.0 g carbohydrate = 20.0 g * 4 kcal/1 g = 80.0 kcal

Therefore, the energy contribution from protein present in the potato is:

84 - 80 = 4.0 kcal

This energy corresponds to 1 g of protein