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Q.

Standard molar enthalpy of combustion of glucose is – 2880 kJ. If only 25% of energy is available for muscular work and 1.0 km walk consumes 90kJ of energy, what maximum distance (in m) a person can walk after eating 90g of glucose.

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Detailed Solution

Energy available $= \frac{25}{100} \times 2880 \times \frac{1}{2} = 360$
Minimum distance = $\frac{1}{90} \times 360 = 4$ km

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