Question

what is the percent by volume of ethanol in a solution made by dissolving 39.5 ml of ethanol in 215 ml of water

Answer 1

the two volumes are taken as additive ( in actuality they will not be) , then Final volume = 39.5+215 = 254.5mL % v/v ethanol = 39.5/254.5*100 = 15.5%l

Answer 2

Answer:

Percent by volume of ethanol = 15.5%

Explanation:

Percent by volume is expressed as % v/v. Mathematically, it is the ratio of the volume of the solute to the volume of the solution (solute+solvent) multiplied by 100.

Formula:

%$v/v = \frac{V(solute)}{V(solution)} *100$

Here:

V(solute=ethanol) = 39.5 ml

V(solution = ethanol + water) = 39.5 + 215 = 254.5 ml

%$v/v = \frac{39.5}{254.5}*100 = 15.5$%