Q:

When the label on a packaged food item states that 100 g contains 650 kJ of energy, it means that

waelhammad
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2022-10-22
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When the label on a packaged food item states that 100 g contains 650 kJ of energy, it means that 

  1. the human body is able to extract 650 kJ of heat and useful work by digesting the food.
  2. 650 kJ of energy was consumed in growing or producing or making the food.
  3. 650 kJ of heat energy is released when 100 g of the food is burned in an atmosphere of pure oxygen.
  4. ultimately your body will be able to perform 650 kJ of work for every 100 g of the food that you eat.
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waelhammad
2022-10-22
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C: Food energy values are determined by burning a sample of the food in a calorimeter and measuring the heat produced. If the body was 100 % effi cient, choice A would be true. 

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