Chapter 23, Problem 86A

Solution

Interpretation : The total energy in kJ that is converted to ATP during the processes of cellular respiration and fermentation is to be calculated and compared.

Concept Introduction : The primary method by which living things produce energy is cellular respiration. Fermentation is the term for the process by which glucose is metabolized in the absence of oxygen.

The energy of cellular respiration is $\text{17860}\text{kJ}$ and the energy of fermentation is $\text{940}\text{kJ}$ .

The energy of cellular respiration is greater than the energy of fermentation.

During cellular respiration, the process by which glucose is broken down to produce carbon dioxide, water, and a significant quantity of energy, oxygen is utilized by living things.

1 mol of glucose creates 38 mol of ATP during cellular respiration.

1 mol of glucose can only yield 2 mol of ATP during fermentation.

The energy of 1mol of ATP is given as:

  $\text{1}\text{mol}\text{ATP}\text{=}\text{470}\text{kJ}$

The energy of cellular respiration for 38 mol of ATP is given as:

  $\begin{array}{c}\text{energy}\text{=}\text{38ATP}\times \text{470}\text{kJ}\\ \text{=17860}\text{kJ}\end{array}$

The energy of fermentation for 2 mol of ATP is given as:

  $\begin{array}{c}\text{energy}\text{=}2\text{ATP}\times \text{470}\text{kJ}\\ \text{= 940}\text{kJ}\end{array}$

The energy of cellular respiration is much greater than the energy of fermentation.