At a certain temperature, K = 1.1 103 for the reaction Fe3+(aq) + SCN2(aq) FeSCN2+(aq)

Question:

At a certain temperature, K = 1.1 × 103 for the reaction Fe3+(aq) + SCN2(aq) ⇌ FeSCN2+(aq) Calculate the concentrations of Fe3+, SCN2, and FeSCN21 at equilibrium if 0.020 mole of Fe(NO3)3 is added to 1.0 L of 0.10 M KSCN. (Neglect any volume change.)