26.8 g of ammonium chloride is dissolved in water to make a 0.25 L solution. what is the molarity of the solution

Respuesta :

Taking into account the definition of molarity,  the molarity of the solution is  2 [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 the solution in this case

In this case, 26.8 g of ammonium chloride is dissolved in water to make a 0.25 L solution. So you know:

  • number of moles= [tex]26.8 gramsx\frac{1 mole}{53.45 grams} =[/tex] 0.50 moles (being 53.45 [tex]\frac{grams}{mole}[/tex] the molar mass of ammonium chloride)
  • volume= 0.25 L

Replacing in the definition of molarity:

[tex]Molarity=\frac{0.50 moles}{0.25 L}[/tex]

Solving:

Molarity= 2 [tex]\frac{moles}{liter}[/tex]

Finally, the molarity of the solution is  2 [tex]\frac{moles}{liter}[/tex].

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