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Question

A person inhales 960 g of O2 per day. Assume that all the O2 is used for converting sugar into CO2 and H2O. Calculate the heat evolved.
(ΔH combustion of sucrose = - 5645 kJ/mol)


A
14112.5 kJ
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B
14112.5 J
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C
855 kJ
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D
5645 kJ
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Solution

The correct option is C 14112.5 kJ
The equation for combustion of sucrose is:
C12H22O11+12O212CO2+11H2O; ΔH=5645 kJ
Moles of O2 used per day =Weight of O2Molecular mass of O2
=96032=30 mol
From Equation,
because 12 mol of O2 is used for combustion of 1 mol of C12H22O11
30 mol of O2 is used for combustion of 112×30 C12H22O11
=2.5 mol C12H22O11
Weight of 1 mol C12H22O11=342 g
2.5 mol C12H22O11=2.5×342=855 g
On combustion of 342 g of C12H22O11 5645 kJ heat is evolved.
On combustion of 855 g of C12H22O11 5645342×855=14112.5 kJ.

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