Electron transfer from NADH or FADH2 to oxygen generates a proton gradient across the mitochondrial membrane. Electrons from NADH result in more protons being pumped across to form the gradient than electrons from FADH2. Calculate the free energy change, ΔG∘′, for the reduction of O2 with FADH2. Round your answer to the nearest whole number.

ΔG∘′ = -200.68kj/mol

Explanation:

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Reduction reaction of O2 with FADH2

FADH2 + 1/2 O2 → H2O + FAD+

Half cell reaction;

Reduction of half reaction; 2H+ +  1/2 O2  +2e- → 2H2O( at cathode)

oxidation half reaction,

FADH2 → FAD+ 2H+ + 2e- ( at anode)

E°Cell = E°cathode - E°anode

E°Cell =  +0.82 -(-0.22)

E°Cell = 1.04v

ΔG∘′ =  -nf E°cell

ΔG∘′ =  -2 x96.48 kj/mol/ v x 1.04v

ΔG∘′ = -200.68kj/mol

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