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Blazing goIITian

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19 Aug 2009 23:16:53 IST

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A person takes 15 breaths per minute .The volume of air inhaled in each breath is 450ml & contains 2

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A person takes 15 breaths per minute .The volume of air inhaled in each breath is 450ml & contains 21% of oxygen by volume .The exhaled air contains 16.1% of oxygen by volume .Both inhaled & exhaled air arc at 298K .If all the oxygen is used in the combustion of sucrose ,how much of the latter is burnt in the body per day & how much of heat is evolved .change in enthalpy of sucrose is = -5645kJ/mol

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Krishna Gopal Singh

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Joined: 29 Dec 2006

Posts: 5153

21 Aug 2009 00:00:45 IST

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Inhaled oxygen = 450*0.21 = 94.5 ml

Exhaled oxygen = 450*0.79*0.161/(1-0.161) = 68.2 ml.

Oxygen consumed per day = (94.5-68.2)*15*60*24/1000 = 568 ltr = 23.2 mole

12 mole O2 reacts with 1 mole of Sucroes. So 23.2 mole O2 will react with 1.93 mole of sucroes = 661g

In this process 5645*1.93 = 10900KJ heat is liberated

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