Answer to Question #161602 in General Chemistry for Willie

Question

Alexandria decides to climb Mt. Krumpett, which is 5000 m high. she determines that this will require a total of 3600 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, 40g of protein. How many nutrition bars should Alexandra pack? Express the number numerically.

Answer 1

The calories per gram of each substance are:

Protein: 4 calories / gram

Carbohydrates: 4 calories / gram

Fat: 9 calories / gram

So, one bar contains:

50 * 4 + 10 * 9 + 40 * 4 = 450 calories

If she were to eat only these bars, she will need:

3,600 / 450 = 8 nutrition bars for her climb