[big]

How many electrons are needed to convert one nitrate ion into one ammonia molecule?

I tried balancing it as a an oxidation-reduction half-reaction, which gave me 5e^- + 6H⁺ + NO₃^- NH₃ + 3H₂O, so I guessed that the answer was 5. It’s supposedly 8 though, how do you get that?

Subject: Conditions at Equilibrium

What condition describes a reaction at equilibrium?
A)   :delta: G = 0
B)   :delta: G° = 0
C)   :delta: G° = :delta: G°
D)   ln K = 0

I know that :delta: G = 0 describes a reaction at equilibrium, but since :delta: G = -RTln(K) and :delta: G=0, then wouldn’t that also imply that ln K = 0 since R and T aren’t 0? Or are we assuming that T could be 0, so A is the answer as opposed to D?

[Borek]

5e^- + 6H⁺ + NO₃^- NH₃ + 3H₂O

It is not balanced.