If the initial amount of Fe(NO₃)₃ transferred to the cuvette is 0.038 mol, and the absorbance measurements indicate that 0.015 mol of FeSCN²⁺ are present at equilibrium, what must be [Fe³⁺] at equilibrium? The total volume of solution in the cuvette is 3.781 mL. Provide your response to two digits after the decimal.
a) 0.57 mol/L
b) 1.68 mol/L
c) 0.40 mol/L
d) 1.05 mol/L