Question

Cytochrome, a complicated molecule that we will represent as CyFe2+, reacts with the air we breathe to supply energy required to synthesize adenosine triphosphate (ATP). At pH 7.0 the following reduction potentials pertain to this oxidation of CyFe2+:

O2(g) + 4 H+(aq) + 4 e- ¨ 2 H2O(l);
E‹red = +0.82 V

CyFe3+(aq) + e- ¨ CyFe2+(aq);
E‹red = +0.22 V

a) What is ĢG for the oxidation of CyFe2+ by air?

b) If the synthesis of 1.00 mol of ATP from (ADP) requires a ĢG of 37.7 kJ, now many moles of ATP are synthesized per mole of O2.

I know for part a you have to add the two Es but after that I'm not sure

Answer 1

What are the funny symbols?

Answer 2

sorry the symbols with the f are delta G

Answer 3

Mastering chemistry homework? Haha.

E^(zero)cell= Cathode-Anode

E^(zero)cell= 0.82V-.22V= 0.6V

Delta G= -n*F*E^(zero)cell

Delta G= -4*96485*0.6

Delta G= -231.564 J or -232 kJ