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in Olympiad by (65.8k points)

During respiration, glucose combines with oxygen in the cells of our body to form carbon dioxide, water and production of energy. Atmospheric air consists of 20% oxygen by volume, only 5% of that oxygen is consumed by the body in each breath of an average person at STP. According to the study an average person at rest inhales 8 litres of air per minute. In 3.5 hrs, how much glucose is used up by an average person at rest ? Find the amount of carbon dioxide exhaled during the process.

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C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy

Person inhales 8 litre air per minute

So vol. of air inhales in 3.5 hr

= 3.5 × 60 × 8 litre

= 1680 litre

Total amount of air inhaled by person = 1680 litre

air contain only 20% oxygen

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