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The volume of water and ethanol in 200 ml solution = 140 ml and 60 ml
The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
There are several concentration units in percentages that can be used:
Percent Volume (% V / V), total volume (ml) of solute in 100 ml of solution.
[tex]\rm \%solute=\dfrac{solute~volume}{solution~volume}\times 100\%[/tex]
30.0% aqueous solution of ethanol
means : 30% is ethanol and 70% is water
For 200 ml of solution :
[tex]\rm ethanol=30\%\times 200~ml=\boxed{\bold{60~ml}}\\\\water=70\%\times 200~ml=\boxed{\bold{140~ml}}[/tex]
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