The percentage by mass of ethyl alcohol in the solution : 27.95%
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.
So the concentration of a solution can be expressed as a percent which is the ratio of solute to solution. Can be expressed in percent of mass (m / m) or volume percent (v / v)
[tex]\tt \%mass=\dfrac{mass~solute}{mass~solution}\times 100\%[/tex]
Solution = Solute + Solvent
The solute is the substance that is dissolved usually in smaller amounts when compared to solvents
Given
22.5 g of ethyl alcohol
58.0 g of water
Required
the percentage by mass
Solution
mass solute = 22.5 g
mass solvent = 58 g
mass solution :
= mass solute + mass solvent
= 22.5 g + 58 g
= 80.5 g
% mass :
[tex]\tt =\dfrac{22.5}{80.5}\times 100\%\\\\=\boxed{\bold{27.95\%}}[/tex]
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