We are given:
200 grams of FeCl₂ in 450 mL of water
Number of Moles of FeCl₂ in 450 mL:
Molar mass of FeCl₂ = 127 grams/mol (approx)
Number of moles = Given mass / molar mass
replacing the variables
Number of moles = 200 / 127
Number of moles = 1.57 moles
Number of Moles of FeCl₂ in 1 L (Molarity):
We know that in 450 mL of the solution, we have 1.57 moles
Molarity of the solution = Number of moles / Volume of solution (in L)
Molarity of the solution = 1.57 / 0.45
Molarity of the solution = 3.489 M
