The enthalpy change involved in the oxidation of glucose is -2880 kJ / mol. Twenty five per cen

step 1 First of all, let's have a look what all is given in the problem. Given is mass of glucose is gi

The enthalpy change involved in the oxidation of glucose is...

The enthalpy change involved in the oxidation of glucose is $-2880 \mathrm{~kJ} / \mathrm{mol}$. Twenty five per cent of this energy is available for muscular work. If $100 \mathrm{~kJ}$ of muscular work is needed to walk $1 \mathrm{~km}$, what is the maximum distance that a person will be able to walk after eating $120 \mathrm{~g}$ of glucose? (a) $19.2 \mathrm{~km}$ (b) $9.6 \mathrm{~km}$ (c) $2.4 \mathrm{~km}$ (d) $4.8 \mathrm{~km}$

The enthalpy change involved in the oxidation of glucose is $-2880 \mathrm{~kJ} / \mathrm{mol}$. Twenty five per cent of this energy is available for muscular work. If $100 \mathrm{~kJ}$ of muscular work is needed to walk $1 \mathrm{~km}$, what is the maximum distance that a person will be able to walk after eating $120 \mathrm{~g}$ of glucose?
(a) $19.2 \mathrm{~km}$
(b) $9.6 \mathrm{~km}$
(c) $2.4 \mathrm{~km}$
(d) $4.8 \mathrm{~km}$

Key Concepts

Unit Conversion and Scaling

This concept involves translating the energy output obtained from chemical reactions into practical units for work, such as the distance that could be covered given a known energy requirement per unit of work. It is an important step in applying abstract energetic calculations to real-world scenarios, such as estimating the physical performance based on energy intake.

Enthalpy Change

This concept refers to the amount of heat released or absorbed during a chemical reaction under constant pressure. In biochemical processes, such as the oxidation of a substrate, the enthalpy change indicates the total energy available from the reaction, and it plays a critical role in determining the energy yield from metabolic processes.

Energy Conversion Efficiency

This concept involves the fraction of the total energy released in a chemical reaction that can be converted into useful work. In the context of muscle activity or any energy conversion process, only a portion of the available chemical energy is transformed into mechanical work due to inefficiencies in the conversion process.

Stoichiometric Conversion

This concept deals with the calculation of the number of moles of a substance based on its mass and molar mass. It is essential for linking macroscopic amounts of a substance to the molecular scale, allowing the calculation of energy released per mole and scaling it to the actual quantity used in a reaction.

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