A serving size of nine cookies contains 7 g of fat, 24 g of carbohydrates, and 9 g of protein. If walking 1 mile consumes 170 kJ of energy, how many miles must you walk to burn off enough calories to eat nine cookies? Assume the energy content of fats, carbohydrates, and proteins are 8 kcal/g, 4 kcal/g, and 4 kcal/g, respectively. 1 cal = 4.184 J. miles Submit Answer Try Another Version 3 item attempts remaining
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
![**Caloric Calculation for Exercise**
A serving size of nine cookies contains the following nutritional content:
- **Fat:** 7 grams
- **Carbohydrates:** 24 grams
- **Protein:** 9 grams
Each nutrient provides energy in the following amounts:
- **Fat:** 8 kcal/gram
- **Carbohydrates:** 4 kcal/gram
- **Protein:** 4 kcal/gram
To calculate the total energy content of the cookies, you multiply the grams of each macronutrient by their respective energy content:
- Energy from fat = 7g × 8 kcal/g = 56 kcal
- Energy from carbohydrates = 24g × 4 kcal/g = 96 kcal
- Energy from protein = 9g × 4 kcal/g = 36 kcal
**Total Energy**: 56 kcal + 96 kcal + 36 kcal = 188 kcal
To convert kilocalories to kilojoules, use the conversion factor: 1 cal = 4.184 joules. Thus, 188 kcal = 188 × 4.184 = 785.6 kJ
If walking 1 mile consumes 170 kJ of energy, calculate how many miles you need to walk to burn off this energy:
785.6 kJ / 170 kJ/mile = 4.62 miles
**Answer Box:** [ ] miles
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