1) Molar concentration (Molarity). This concentration unit tells us the amount a solute per unit of volume.
[tex]M=\frac{n}{v}[/tex]
M: Molar concentration
n: moles of solute
v: liters of solution
Mr. Orlin is incorrect because he used grams instead of moles.
2) Calculating the molarity of the solution
Convert grams of FeCl2 to moles
The molar mass of FeCl2 is 126.75 g/mol
[tex]mol_{}FeCl_2=200gFeCl_2\cdot\frac{1molFeCl_2}{126.75gFeCl_2}=1.578molFeCl_2[/tex]
Plug in known values
[tex]M=\frac{1.578molFeCl_2}{0.45L}=3.507MFeCl_2[/tex]
The concentration of a 0.45 L solution containing 200 g of iron (II) chloride is 3.507 M FeCl2.
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