A person inhales 640 g of O_(2) per day. If all the O_(2) is used for converting sugar into CO_(2) and H_(2)O , how much sucrose (C_(12)H_(22)O_(11)) is consumed in the body in one day and what is the heat evolved ? DeltaH ( combustion of sucrose) =-5645 " kJ mole"^(-1).

A person inhales 640 g of O_(2) per day. If all the O_(2) is used for

1.	A person inhales 640 g of O_(2) per day. If all the O_(2) is used for converting sugar into CO_(2) and H_(2)O , how much sucrose (C_(12)H_(22)O_(11)) is consumed in the body in one day and what is the heat evolved ? DeltaH ( combustion of sucrose) =-5645 " kJ mole"^(-1).
Answer» Solution :MOLES of `O_(2)` inhaled by a person in one day `=(640)/(32)=20` Given that, `C_(12)H_(22)O_(11)+12O_(2) to 12CO_(2)+11H_(2)O,DeltaH=-5645"KJ"` Thus, 12 moles of `O_(2)` consume 1 mole of sucrose or 12 moles of `O_(2)` consume 342 g of sucrose `:. 20` "mole" of `O_(2)` consume `(342)/(12)xx20,i.e., 570g` of sucrose Further, 342g (1 "mole") of sucrose LIBERATES 5645 kJ `:. 570 g` of sucrose should liberate`(5645)/(342)xx570=9408.34"kJ"`.