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Chapter 19: Q12P (page 662)

Calculate 螖蔚0'and 螖G0'for the light reactions in plants, that is, the four-electron oxidation of H2O by NADP+.

Short Answer

Expert verified

The values of螖骋0'=438kJ/mol and 螖蔚0'=-1.135V.

Step by step solution

01

Obtaining values of Δε0'and ΔG0'

The values of 螖蔚0'and 螖骋0'are obtained from the figure of the Z-scheme photosynthesis.

02

Calculating the number of electrons

The value of 螖蔚0'is found to be;

螖蔚0'=-0.320V-0.815V=-1.135V

From the following reaction, the number of electrons is obtained;

2H2O鈫�4H++O2+4e-

Therefore, the number of electrons was found to be 4.

03

Calculating the change of free energy

螖骋0'=-苍贵螖蔚0'螖骋0'=-4脳96,485C/mol脳-1.135V=438000J/mol=438kJ/mol

Hence, the value of 螖骋0'=438kJ/moland 螖蔚0'=-1.135V.

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Most popular questions from this chapter

Explain the relationship between the light and dark reactions.

In an effort to increase the efficiency of photosynthesis in crop plants, researchers have genetically engineered tobacco plants (a model organism) to express cyanobacterial RuBP carboxylase, which has lower oxygenase activity. However, tobacco plant growth was not enhanced unless the plants were also engineered to express the cyanobacterial genes for bicarbonate transporters. Explain this observation.

Calculate the energy of one mole of photons of red light (位=700 nm).

Describe the chemistry of the RuBP carboxylase reaction.

Why would 鈥渒nocking out鈥� a gene for a chloroplast fatty acid desaturase (an enzyme involved in synthesizing fatty acids containing threedouble bonds) increase the rate of photosynthesis at 40掳C, a temperatureat which photosynthesis is normally impaired?
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