One slice of bread with a tablespoon of peanut butter on it contains 20g carbohydrate, 10g protein,and 9g fat. Calculate total energy consumed in this intake
Correct answer: C. 201kcal
- A. 158kcal
- B. 173kcal
- C. 201kcal
- D. 218kcal
Explanation
Energy from carbohydrates=20g×4kcal/g=80kcalEnergy from protein=10g×4kcal/g=40kcalEnergy from fat=9g×9kcal/g=81kcalTotal energy=Energy from carbohydrates+Energy from protein+Energy from fatTotal energy=80kcal+40kcal+81kcal=201kcal
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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