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.

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.