Alexandra decides to climb mt. krumpett, which is 5000 m high. she determines that this will require a total of 2700 kcal of energy for the trip. for her food supply, she decides to take nutrition bars. the label states that each bar contains 50 g of carbohydrates, 10 g of fat, and 40 g of protein.

The amount of energy present in the food and fuel is called calorific value. The specified quantity gets combusted at a constant pressure under normal conditions.

It is measured in kilojoule per kilogram (KJ/Kg)

The total energy of the food can be calculated by adding the energies from all the contained food components.

       Then, the energy from 50 g of carbohydrate = 50 × 4 kcal/g

       = 200 kcal

      Then, the energy from 10 g of fats= 10 × 9 kcal/g

      = 90 kcal

       Then, the energy from 40 g of protein = 40 × 4 kcal/g

       = 160 kcal

      Total energy = 200 kcal + 90 kcal + 160 kcal

       = 6

Therefore, she needs 6 nutrition bars.

To learn more about calorific value refer to the link:

link

b) nuclear ive learned that in a pedtrodic table