What is the initial concentration (at the instant of mixing)?

Consider the chemical equilibrium, Fe3+(aq)+SCN(aq)FeSCN2+(aq) The equilibrium concentration of [FeSCN2+]e for this reaction can be determined using a spectrophotometer and is related to the absorbance, A, by the expression: A=l[FeSCN2+]e where =3300M1cm1 is the molar absorptivity constant and l=1cm is the spectrophotometer cell path length. A solution was made up by mixing 25.0cm3 of 2.0103MFeMe(NO3)3(aq) with 25.0cm3 of 2.0103MKSCN(aq) at 25. The measured absorbance at equilibrium was 0.225. The initial concentration (at the instant of mixing) of [Fe3+]is Select one: a. 0.225M b. 2.0103M c. 5.0105M d. 2.0104M e. 1.0103M