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Chapter 19: Q11P (page 662)

Estimate the change in free energy whenundergoes photooxidation.

Short Answer

Expert verified

The change in free energy when P960 undergoes photo-oxidation is 140kJ/mol.

Step by step solution

01

Photooxidation

The rate of photosynthesis can occasionally be inhibited by strong light intensities because they oxidize the chlorophyll and this process is referred to as photo-oxidation.

02

Step 2: The change in free energy

From the figure of photosynthetic electron-transport system of purple bacteria, the change in redox potential is Δεo'=-1.5V.

In this case, n of electrons is 1.

The change in free energy is calculated using the following equation:

ΔGo'=-nFΔεo'ΔGo'=(-1)×96ΔGo\cent=(-1)×(96,485C/mol)×(-1.5V)=140000J/mol=140kJ/mol

Hence, the change in free energy is 140kJ/mol.

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Most popular questions from this chapter

The three electron-transporting complexes of the thylakoid membrane can be called plastocyanin–ferredoxin oxidoreductase, plastoquinone– plastocyanin oxidoreductase, and water–plastoquinone oxidoreductase. What are the common names of these enzymes and in what order do they act?

Why is it possible for chloroplasts to absorb much more than 8–10 photons per O2 molecule evolved?

Compare and contrast photophosphorylation and oxidative phosphorylation.

One aspect of climate change is that average night-time temperatures have increased more than average daytime temperatures have increased. Since the rates of metabolic processes, including photosynthesis and cellular respiration, depend on temperature, how might climate change affect plant growth?

Describe the events that occur after the special pair of PbRC absorbs a photon.
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