Question

If you evaporated 125 mL of a 3.5 M solution of iron(II) nitrite, how many moles of iron(II) nitrite would you recover?

Answer 1

Considering the definition of molarity, 0.4375 moles of iron(II) nitrite you would recover.

In order to find the moles of the solid that can be recovered from this solution, you need to use the definition of molarity.

Definition of molarity

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

$Molarity=\frac{number of moles}{volume}$

Molarity is expressed in units $\frac{moles}{liters}$.

Moles of iron(II) nitrite

In this case, you evaporated 125 mL of a 3.5 M solution of iron(II) nitrite​. Then you know:

• Molarity= 3.5 M
• number of moles= ?
• volume= 125 mL= 0.125 L (being 1000 mL= 1 L)

Replacing in the definition of molarity:

$3.5 M=\frac{number of moles}{0.125 L}$

Solving:

number of moles= 3.5 M× 0.125 L

number of moles= 0.4375 moles

Finally, 0.4375 moles of iron(II) nitrite you would recover.

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