10 g of beet sugar containing 95% sucrose was added to the tea. How much energy can the body absorb from a given portion of sugar with an efficiency of 56%? How much energy is lost as heat?
1) We calculate the content of pure sucrose in 10 g of sugar:
10 g is 100%
x g is 95%, x = 9.5 g (sucrose).
2) It is known that the oxidation of 1 g of carbohydrates releases 17.6 kJ of energy. We calculate how much energy is contained in 9.5 g of sucrose:
17.6 kJ x 9.5 g = 167.2 kJ.
3) The human body assimilates only 56% of this energy, i.e.:
167.2 kJ – 100%
x kJ – 56%,
x = 93.632 kJ (used by the body).
4) Determine the amount of energy lost in the form of heat:
167.2 kJ – 93.632 kJ = 73.568 kJ (consumed as heat).
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