Question

Chemistry Molarity (measuring the concentration of a solution) - Correct the Question

Answer 1

1) Molar concentration (Molarity). This concentration unit tells us the amount a solute per unit of volume.

`M=(n)/(v)`

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

`mol_{}FeCl_2=200gFeCl_2\cdot(1molFeCl_2)/(126.75gFeCl_2)=1.578molFeCl_2`

Plug in known values

`M=(1.578molFeCl_2)/(0.45L)=3.507MFeCl_2`

The concentration of a 0.45 L solution containing 200 g of iron (II) chloride is 3.507 M FeCl2.

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