The reaction between nitrogen and hydrogen to produce ammonia is described as an equilibrium reaction. What substances are present in the reaction mixture when equilibrium has been obtained?
a) 3H2 + N2 = 2NH3
b) N2
c) H2
d) NH4+
e) NH3

The answer is a), b), and c).

N^2 and H^2 are the reactants and NH^3 is the product and are all included in the reaction mixture when equilibrium has been obtained.

you need to give more information

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.