How do I solve this "Aqueous iron(II) chloride reacts with aqueous lithium bromide to form aqueous iron(II) bromide and aqueous lithium bromide. " I have to put a formula as my answer.

16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.