Answer to Question #220903 in Organic Chemistry for Meg

Question

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.

Answer 1

$moles = mass\div molecular mass$

$mass = .0056 \times46\\ =0.2575$

$density = mass\div volume$

$volume = .2575 \div .785\\ = 4.33$

$\%$ $\%v\div v= volume of solute (ml)\div volume of solution(ml)$

$=.33\div4 \times100\\ =8.25$