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Taking into account the definition of molarity, the molarity of the solution is 0.78 [tex]\frac{moles}{liter}[/tex].

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:

[tex]molarity=\frac{number of moles}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

Molarity of a solution of NaNO₃

In this case, you know:

  • number of moles= 6.631 g× [tex]\frac{1 mole}{85 g}[/tex]= 0.078 moles (being 85[tex]\frac{g}{mole}[/tex] the molar mass of NaNO₃, this is,the amount of mass that a substance contains in one mole.)
  • volume= 100 mL= 0.1 L

Replacing in the definition of molarity:

[tex]molarity=\frac{0.078 moles}{0.100 L}[/tex]

Solving:

molarity= 0.78 [tex]\frac{moles}{liter}[/tex]

Finally, the molarity of the solution is 0.78 [tex]\frac{moles}{liter}[/tex].

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