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Question

If 150kJ of energy is needed for a man to walk a distance of 1km, then how much of glucose one has to consume to walk a distance of 5km, provided that only 30% of the energy available for muscular work. (The enthalpy of combustion glucose is 3000kJmol1).

A
75 g
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B
30 g
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C
180 g
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D
150 g
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E
45 g
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Solution

The correct option is B 150 g
For walking 1 km the man needs 150KJ of energy. To walk 5 kms he needs 150×5=750 KJ energy. If only 30% of energy is available for muscular work, the total energy needed will be 75030×100=2500KJ1 mole of glucose produces 3000 KJ. Then for producing 2500 KJ, 5/6 mole of glucose = 56×180=150 gms of glucose will be needed (assuming the molecular weight of glucose=180 gms)

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