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Elanso [62]
2 years ago
14

10.0 g of table salt, NaCl, is dissolved in water to a total volume of 125.0 mL. What is the resulting molar concentration of th

e table salt?
Medicine
1 answer:
marysya [2.9K]2 years ago
5 0

Taking into account the definition of molarity, the molar concentration of the table salt is 1.368 \frac{moles}{liters}.

<h3>Definition of molarity</h3>

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}.

<h3>Molar concentration of the table salt</h3>

In this case, you have:

  • number of moles= 10 g×\frac{1 mole}{58.45 g}= 0.171 moles [being 58.45\frac{g}{mole} the molar mass of NaCl]
  • volume= 125 mL= 0.125 L [being 1000 mL= 1 L]

Replacing in the definition of molarity:

molarity=\frac{0.171 moles}{0.125 L}

Solving:

<u><em>molarity= 1.368 </em></u>\frac{moles}{liters}

Finally, the molar concentration of the table salt is 1.368 \frac{moles}{liters}.

Learn more about molarity:

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