Question

The enthalpy change involved in oxidation of glucose is $-2880{\text{kJ mol}}^{-1}$. 25% of this energy is available for muscular work. If $100\text{kJ}$ of muscular work is needed to walk one km, then the maximum distance (in km) that a person will be able to walk after taking $150\text{g}$ of glucose is:

Answer 1

The energy involved during oxidation of $150\text{g}$ glucose is $=\frac{2880\times 150}{180}=2400\text{kJ}$
Energy available for muscular work $=\frac{2400}{4}=600\text{kJ}$
Energy required for 1 km walk $=100\text{kJ}$
Therefore the distance that a person will be able to walk taking $150\text{g}$ glucose $=6\text{km}$.