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A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. how many kcal of energy does the cheeseburger contain? (the accepted caloric values for foods are 4.0 kcal/g for carbohydrate, 9 kcal/g for fat, and 4 kcal/g for protein.) report the answer to 2 significant figures.

Respuesta :

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We simply get the sum of the product of each mass and caloric values.

Total energy = 19 g * 9 kcal / g + 20 g * 4 kcal / g + 28 g * 4 kcal / g

Total energy = 363 kcal

 

Rounding of f to 2 significant fig:

Total energy = 360 kcal

The measure of heat and energy present in the fuel and food is called the calorific value. The calorific value is measured in kilojoule per kilogram (KJ/Kg)

The total energy of one meal is calculated by directly adding the energy given by carbohydrates, fats and proteins.

The energy can be calculated as:

  • Energy from 1 gm of carbohydrate = 4.0 kcal/g

       Then, the energy from 20 g of carbohydrate = 20* 4 kcal/g

       = 80 kcal/g

  • Energy from 1 gm of fats = 9.0 kcal/g

       Then, the energy from 19 g of fats= 19* 9 kcal/g

       = 171 kcal/g

  • Energy from 1 gm of protein = 4.0 kcal/g

       Then, the energy from 28 g of protein = 28* 4 kcal/g

       = 112 kcal/g

  • Now add the energy from all the constituents:

      Total energy = 80 kcal/g + 171 kcal/g + 112 kcal/g

       = 363 kcal/g

Therefore, the total amount of kcal of energy present in the cheeseburger is 363 kcal.

To learn more about total energy and calories refer to the link:

https://brainly.com/question/19928430

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