Question

Typical foods produce 9 cal/g for their fat content and 4 cal/g for their protein and carbohydrate content. if a typical apple weighs 225 g and is 84% water, 14% carbohydrate, and 0.5% fat, how many calories of food energy does an apple provide?

Answer 1

Typical apples contain 84% water, 14% carbohydrates and 0.5% fat, a total of 98.5% content in the apple while the rest are possibly some fibers like the skin and solids that cannot be eaten such as seeds. To calculate the calorie content of the apple on the basis of 255 g, know first the weight of carbohydrates and fats in the apple and find their contribution to energy burned and water cannot be burned since it does not contain a carbon atom

Carbohydrate content : ((255 g*0.14)* 4 cal/g = 142.9 cal
Fat content : ((255 g*0.005)*9 cal/g = 11.475 cal
Total: 154.375 cal on a 255 g apple

Answer 2

Answer:

An apple provides a total of 136.125 calories.

Explanation:

We know that

• An apple weighs 225 grams, it has 84% water, 14% carbohydrate and 0.5% fat.
• Also, typical foods produce 9 calories per gram for their fat content and 4 calories per gram for their protein and carbohydrate content.

So, to find the answer, we need to know the number of grams that is fat and carbohydrate.

Using the given percentages, we have

Fat: $(0.5\%)(225g)=0.005(225g)=1.125g$

Carbohydrate: $(14\%)(225g)=0.14(225g)=31.5g$

An apple has 1.125 grams of fat and 31.5 grams of carbohydrates.

If there are 9 calories per gram of fat, the total number of calories in this case would be

Fat: $1.125g(9\frac{cal}{g})= 10.125cal$

If there are 4 calories per gram of carbohydrate, the total number is

Carbohydrate: $31.5g(4\frac{cal}{g})= 126cal$

Therefore, an apple provides 10.125 calories from fat and 126 calories from carbohydrates, for a total of 136.125 calories.