Calculate the concentration of ethanol in a sample of wine in %v/v if the wine is found to contain 0.0056 moles of ethanol in a 4.00mL sample of wine and the density of ethanol is 0.785gmL-1.
moles=mass÷molecularmassmoles = mass\div molecular massmoles=mass÷molecularmass
mass=.0056×46=0.2575mass = .0056 \times46\\ =0.2575mass=.0056×46=0.2575
density=mass÷volumedensity = mass\div volumedensity=mass÷volume
volume=.2575÷.785=4.33volume = .2575 \div .785\\ = 4.33volume=.2575÷.785=4.33
% %v÷v=volumeofsolute(ml)÷volumeofsolution(ml)\%v\div v= volume of solute (ml)\div volume of solution(ml)%v÷v=volumeofsolute(ml)÷volumeofsolution(ml)
=.33÷4×100=8.25=.33\div4 \times100\\ =8.25=.33÷4×100=8.25
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