A person inhales `640g ` of `O_(20` 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_("combination of sucrose ")=-5645kJ mol^(-1))`

Explanation

`C_(12)H_(22)O_(11) +12O_(2) rarr 12 CO_(2)+11H_(2)O DeltaH =- 5645 kJ`
Moles of `O_(2)` per day `= (640)/(32) = 20 mol O_(2)`
Moles of sucrose used/day `= (20)/(12) or (20)/(12) xx 342 g = 570 g`
`DeltaH = (5645 xx 20)/(12) = 9408.34 kJ`