%m/v of ethanol : = 11.66%
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
Percent mass/volume (%m/v) :
[tex]\tt \%m/v=\dfrac{mass~of~solute(g)}{volume~of~solution(ml)}\times 100\%[/tex]
Given
20.0 g ethanol (density = 0.698 g/ml)
115.0 g acetone (density = 0.805 g/ml)
Required
the mass/volume percentage concentration of ethanol
Solution
volume of ethanol :
= 20 g : 0.698 g/ml
= 28.65 ml
volume of acetone :
= 115 g : 0.805 g/ml
= 142.86 ml
Total volume of solution :
= 28.65 + 142.86
= 171.51 ml
%m/v of ethanol :
= (20 g : 171.51 ml) x 100%
= 11.66%
Amount of ethyl alcohol
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Volume of methanol
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The percentage concentration of the Hydrogen Peroxide
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