In arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate.
Half-Reaction
E' (V)
+0.815
02 + 4H+ + 4e" + 2 H2O
NAD+ + H+ + 2 e NADH
-0.320
In human cells a compound known as NADH is involved in a reaction that generates an electrical potential. The
reaction is based on the two half-reactions shown in the table above. The balanced equation for the overall reaction is
shown below.
Su
O2 + 2 H+ 2 NADH + 2 H2O + 2 NAD+
(a) How many moles of electrons are transferred for each mole of 02 that reacts? Justify your answer in terms of the
balanced equation and the change in oxidation number of oxygen.