To calculate the concentration of a solution, we first need to convert the mass of the solute (in this case, Iron (II) chloride, FeCl2) into moles. The molar mass of FeCl2 is calculated as follows: Iron (Fe) has a molar mass of approximately 55.85 g/mol, and Chlorine (Cl) has a molar mass of approximately 35.45 g/mol. Since there are two chlorine atoms in FeCl2, the total molar mass is 55.85 g/mol + (2 * 35.45 g/mol) = 126.9 g/mol. Next, we convert the mass of FeCl2 (200.0 g) into moles by dividing by its molar mass: 200.0 g / 126.9 g/mol = 1.576 moles. Finally, we convert the volume of the solution from milliliters to liters: 450.0 mL = 0.4500 L. The concentration (C) is then calculated using the formula C = moles/volume. Therefore, C = 1.576 moles / 0.4500 L = 0.444 M.