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40.0g of ethanol, C2H5OH, is dissolved in 150.0L of solution. Determine the molarity of ethanol in this solution.

Sagot :

CintiaSalazar

Answer:

The molarity of ethanol is 5.8*10⁻³ M.

Explanation:

Molar concentration is a measure of the concentration of a solute in a solution, be it some molecular, ionic or atomic species.

Molarity or Molar Concentration is the number of moles of solute that are dissolved in a certain volume. It is calculated by dividing the moles of the solute by the volume of the solution:

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

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

Being the molar mass of ethanol 46 [tex]\frac{g}{mol}[/tex], then the number of moles that 40 grams of ethanol contain is calculated by:

[tex]40 grams*\frac{1 mol}{46 grams} =0.87 moles[/tex]

So, being:

  • number of moles of solute= 0.87 moles
  • volume 150 L

Replacing in the definition of molarity:

[tex]Molarity=\frac{0.87 moles}{150 L}[/tex]

Solving:

Molarity= 5.8*10⁻³ M

The molarity of ethanol is 5.8*10⁻³ M.

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