Question

The 225 g FeCl₂ is about 1.8 moles.

What is the molar concentration of the solution if the total volume is 450 mL?
___mol/L

Answer 1

The molar concentration of the FeCl2 solution is found by dividing the number of moles of FeCl2 (1.775 mol) by the volume of the solution in liters (0.450 L), yielding approximately 3.944 mol/L.

Step-by-step explanation:

To determine the molar concentration of the FeCl2 solution, given 225 g of FeCl2 and the total volume of 450 mL, we can follow these steps:

1. Calculate the molar mass of FeCl2: (55.845 g/mol Fe) + (2 × 35.453 g/mol Cl) = 126.751 g/mol FeCl2.
2. Calculate the number of moles of FeCl2: 225 g ÷ 126.751 g/mol = 1.775 moles (approximated to 1.8 moles mentioned).
3. Convert the volume from mL to liters: 450 mL = 0.450 L.
4. Calculate the molarity (M): moles of solute ÷ liters of solution = 1.775 moles ÷ 0.450 L = 3.944 M (to three significant figures).

The molar concentration of the FeCl2 solution is approximately 3.944 mol/L.