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Question

On average a person requires 2870 kcal of energy for leading a normal life. The amount of cane-sugar in g must be consumed, if all the required energy has to be derived from the combustion of cane-sugar is:

[Given : The heats of formation for cane-sugar (s), CO2(s) and H2O(l) are -530, -94.0 and -68.3 kcal respectively.]

A
545.2
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B
727.6
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C
421.2
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D
213.5
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Solution

The correct option is A 727.6
C12H22O11+12O212CO2+11H2O

ΔHcom= Heat of combustion

=(+530.31)+(12(94.06)+11(68.31)

=+530.31+(1128.72+(751.31))

=1880.02+530.31=1349kcal for 1mole (energy liberated)

This much energy is obtained and utilized from 1 mole of cane-sugar.

No. of moles needed =28701349=2.127mole

Molecular mass of C12H22O11=342

Mass of canesugar =2.127×342gm=727.6gm

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