To calculate the molarity of the solution, we first need to determine the number of moles of FeCl2 present in the solution.
The molar mass of FeCl2 is 126.75 g/mol (55.85 g/mol for Fe and 35.45 g/mol for Cl).
Number of moles of FeCl2 = mass of FeCl2 / molar mass of FeCl2
= 5.035 g / 126.75 g/mol
= 0.0397 mol
Now we can calculate the molarity of the solution:
Molarity = moles of solute / liters of solution
Since we have 500 mL of solution, we need to convert it to liters by dividing by 1000:
Liters of solution = 500 mL / 1000 mL/L
= 0.5 L
Now we can calculate the molarity:
Molarity = moles of solute / liters of solution
= 0.0397 mol / 0.5 L
= 0.0794 M
Therefore, the molarity of the solution containing 5.035 grams of FeCl2 in enough water to make 500 mL of solution is 0.0794 M.