Posted by ris on Tuesday, June 14, 2011 at 3:31pm.
a 250.0 mL of solution contains 50.0 mL acetone and 45.0 mL ethyl alcohol and the remainder water. Calculate the % acetone,
% ethyl alcohol, and water in the solution. Show calculations.

chem 1151  Summer, Tuesday, June 14, 2011 at 3:37pm
20.0% acetone
18.0% Ethyl Alcohol
62.0% water
You take the mL you're trying to find divided by the whole solution, then multiply by 100.
For example, you have 50.0mL/250.0mL = 0.20
Take 0.20 x 100 and it will give you the percent.