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.
