Consider the following half-reactions and their standard reduction potentials then give the standard line (cell) notation for a voltaic cell built on these half reactions. mn2+(aq) + 2 e- < => mn(s) e° = -1.18 v fe3+(aq) + 3 e- < => fe(s) e° = -0.036 v

Explanation:

The given half reactions are:

where E° is the standard reduction potential.

The electrode with a higher (more positive) reduction potential serves as the cathode.

Here, E°(Fe3+/Fe) > E°(Mn2+/Mn)

Hence Fe3+/Fe = cathode

Mn2+/Mn = anode

As per convention, the cell notation is represented such that the anode half cell is on the left and cathode on the right. Both a separated by a salt bridge represented by the symbol ('||')

Cell notation:

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .