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Suppose you have a sample of table salt (NaCl) that has a mass of 100.0 grams. If
this amount of salt is added to a large beaker and filled with water until the total
volume is 2 liters, what is the concentration of this solution in units of Molarity?
Please do not include any units in your answer.

Respuesta :

CintiaSalazar

Taking into account the definition of molarity, the concentration of the solution is 0.855 [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 NaCl

In this case, you have:

  • number of moles of NaCl= [tex]100 grams\frac{1 mole}{58.45 grams} =[/tex]1.71 moles (being 58.45 g/mole the molar mass of NaCl)
  • volume 2 L

Replacing in the definition of molarity:

[tex]Molarity=\frac{1.71 moles}{2 L}[/tex]

Solving:

Molarity= 0.855 [tex]\frac{moles}{liter}[/tex]

Finally, the concentration of the solution is 0.855 [tex]\frac{moles}{liter}[/tex].

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