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23 Nov 2019

post 5 - Nutritional energy

Wrong- 248 as well as 250 is wrong

± Nutritional Energy

Alexander, who weighs 189 lb , decides to climb Mt. Krumpett, which is 5560 m high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100-g bar contains 10 g of fat, 40 g of protein, and 50 g of carbohydrates.

One gram of fat contains 9 Calories, whereas each gram of protein and carbohydrates contains 4 Calories.

Nutrition facts Calories per gram
Fat 9
Protein 4
Carbohydrates 4

Part A

Alexander wants to know exactly how many bars to pack in his backpack for the journey. To provide a margin of safety, he assumes that he will need as much energy for the return trip as for the uphill climb. How many bars should Alexander pack?

Enter the exact answer to two significant figures. Do not round to an integer.

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Keith Leannon
Keith LeannonLv2
28 Jan 2019

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Related questions

Alexander, who weighs 198lb , decides to climb Mt. Krumpett,which is 5850m high. For his food supply, he decides to takenutrition bars. The label on the bars states that each 100-g barcontains 10 g of fat, 40 g of protein, and 50 g ofcarbohydrates.

One gram of fat contains 9 Calories, whereas each gram ofprotein and carbohydrates contains 4 Calories.

Alexander wants to know exactly how many bars to pack in hisbackpack for the journey. To provide a margin of safety, he assumesthat he will need as much energy for the return trip as for theuphill climb. How many bars should Alexander pack?

Part A - Equations Associated with Enthalpies of Formation

If the heat of formation of H2O(l) is -286 kJ/mol, which of the following thermochemical equations for the formation of H2O is correct?

If the heat of formation of is -286 , which of the following thermochemical equations for the formation of is correct?

2 H(g) + O(g) → H2O(l) ΔH=−286 kJ
H2(g) + O(g) → H2O(g) ΔH=−286 kJ
2 H2(g) + O2(g) → 2 H2O(l) ΔH=−286 kJ
H2(g) + 12 O2(g) → H2O(l) ΔH=−286 kJ

H2O(l) → H2(g) + 12 O2(g) ΔH=286 kJ

NUMBER 2

Alexander, who weighs 195 lb , decides to climb Mt. Krumpett, which is 5300 m high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100-g bar contains 10 g of fat, 40 g of protein, and 50 g of carbohydrates.

One gram of fat contains 9 Calories, whereas each gram of protein and carbohydrates contains 4 Calories.

Nutrition facts Calories per gram
Fat 9
Protein 4
Carbohydrates 4

Alexander wants to know exactly how many bars to pack in his backpack for the journey. To provide a margin of safety, he assumes that he will need as much energy for the return trip as for the uphill climb. How many bars should Alexander pack?

Enter the exact answer to two significant figures. Do not round to an integer.

The label of a black cherry almond energy bar with a mass of 68 g lists the nutrition facts as 39 g of carbohydrate, 5 g of fat, and 10. g of protein. (2.5, 2.6, 3.4, 3.5)

Using the energy values for carbohydrates, fats, and proteins (see table below), what are the total kilocalories (Calories) listed for a black cherry almond bar? (Round off answers for each food type to the tens place.)

TABLE 3.7 Typical Energy
Values for the Three Food
Types
Food Type kcal/g kJ/g
Carbohydrate 4 17
Fat 9 38
Protein 4 17

Express your answer with the appropriate units.

B: What are the kilojoules for the black cherry almond bar? (Round off answers for each food type to the tens place.)

C: If you obtain 160 kJ

, how many grams of the black cherry almond bar did you eat?

Express your answer to two significant figures and include the appropriate units.

D:I f you are walking and using energy at a rate of 840

kJ/h , how many minutes will you need to walk to expend the energy from two black cherry almond bars?

Express your answer to two significant figures and include the appropriate units.

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