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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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