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What is the molarity of a solution prepared by dissolving 30.0 grams of NaOH in enough water to make a solution with a total volume of 2.40 liters? (5 points)

0.150 M NaOH

0.218 M NaOH

0.313 M NaOH

0.462 M NaOH

Respuesta :

Answer:

0.313 M NaOH

Explanation:

Got it right on the test.

CintiaSalazar

Taking into account the definition of molarity, the molarity of the solution is 0.313 M.

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].

This case

In this case, you know:

  • number of moles= 30 grams×[tex]\frac{1 mole}{40 grams}[/tex]= 0.75 moles (being 40 [tex]\frac{grams}{mole}[/tex] the molar mass of NaOH)
  • volume= 2.40 L

Replacing in the definition of molarity:

[tex]molarity=\frac{0.75 moles}{2.40 L}[/tex]

Solving:

molarity= 0.313 M

Finally, the molarity of the solution is 0.313 M.

Learn more about molarity:

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