Question

determine the total kilocalories for a diet that consists of 61 g of carbohydrate, 8 g of fat, and 190 g of protein. express your answer to two significant figures and include the appropriate units.

Explanation:

Step1: Calculate kcal from carbohydrate

Carbohydrates provide 4 kcal/g. So for 61 g of carbohydrate, the kcal is $61\times4 = 244$ kcal.

Step2: Calculate kcal from fat

Fats provide 9 kcal/g. So for 8 g of fat, the kcal is $8\times9=72$ kcal.

Step3: Calculate kcal from protein

Proteins provide 4 kcal/g. So for 190 g of protein, the kcal is $190\times4 = 760$ kcal.

Step4: Calculate total kcal

Add the kcal from each macronutrient: $244 + 72+760=1076$ kcal.
Rounding to two significant - figures, $1076\approx1.1\times10^{3}$ kcal.

Answer:

$1.1\times 10^{3}$ kcal