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Standard Reduction Potentials (E)\left( E ^ { \circ \prime } \right)

Question 42

Essay

Standard reduction potentials (E)\left( E ^ { \circ \prime } \right) and standard free energy change (ΔG)\left( \Delta G ^ { \circ \prime } \right) are related by the
equation ΔG=nFE\Delta G ^ { \circ \prime } = - n F E ^ { \circ \prime } , where F is the Faraday’s constant and n is the number of electrons
transferred from donor to acceptor. ΔG\Delta G ^ { \circ } has units of kJ/mol. Which of the following redox pairs
will have the highest ΔG\Delta G ^ { \circ ' } value?

(1) NO+2H++2eNO+H2OE0=+420mV\mathrm { NO } + 2 \mathrm { H } ^ { + } + 2 \mathrm { e } ^ { - } \rightarrow \mathrm { NO } + \mathrm { H } _ { 2 } \mathrm { O } \quad E ^ { 0' } = + 420 \mathrm { mV }

(2) NO+8H++6eNH+2H2OE=+440mV\mathrm { NO } + 8 \mathrm { H } ^ { + } + 6 \mathrm { e } ^ { - } \rightarrow \mathrm { NH } + 2 \mathrm { H } _ { 2 } \mathrm { O } \quad E ^ { \circ \prime } = + 440 \mathrm { mV }

Correct Answer:

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Although the standard reduction potentia...

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