Question

The total energy value of 100g of cereal is 2000 Kj. The boy requires 5
500KJ of energy per day. How much cereal does he need to eat in order
to obtain this? show all calculations​

Answer 1

Explanation:

Food that we eat gives us energy to go through our day. It gives us energy by providing energy to the cells inside our body. Carbohydrates in food are used first. When they are all used up, the body then uses fats, and then proteins as energy sources. So carbohydrates, fats and proteins provide energy to our bodies through the foods that we eat.

The energy in the food that we it is measured in units of kilocalories or Calories. The Calorie (Cal, with an uppercase C) used to measure the nutrition in food is actually 1000 calories (cal) (with a lowercase c) or 1 kilocalorie (kcal). While the Calorie unit is used widely in the U.S., the kilojoule (kJ) is in widespread use internationally. The conversion factors for calories, kilocalories, joules, kilojoules, and Calories are as follows:

Energy Values used in Nutrition

1000cal = 1 kcal = 1 Cal

4184 J = 4.184 kJ = 1 Cal

Nutrition labels are currently a requirement on most packaged foods sold in the United States and internationally. The nutrition facts (as they are also called) usually include how many calories are in the food, how much carbohydrates, fat and proteins are present as well as the Calories per gram of each type of energy source. In order to determine the energy in the food, the food is burned in a calorimeter (described in more detail in the following section) in the laboratory to obtain the energy value in units of kJ/g or kcal/g, typically. A food sample is put into a steel container containing oxygen and in the surrounding chamber, a measured amount of water. The energy value is determined based on the mass of the food and water and the increase in temperature.

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Answer 2

The boy should consume 275 grams of cereal to get 5500 Kj of energy.

Given,

The total energy value of 100g of cereal is 2000 Kj.

To Find,

The amount of cereal the boy requires to get 5500 Kl of energy.

Solution,

The amount of energy in 100 grams of cereal = 2000 Kj

The amount of energy in 1 gram of cereal = 2000/100 = 20 Kj.

Let us assume that the boy needs to consume x amount of cereal to get 5500 Kj of energy.

So,

The amount of energy in x grams of cereal = 5500 Kj

So,

x = 5500/20 = 275 grams

Hence, the boy should consume 275 grams of cereal to get 5500 Kj of energy.

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