Friday
May 22, 2015

Homework Help: Chemistry

Posted by Shelly on Tuesday, November 29, 2011 at 9:24pm.

At 20 degrees C ethanol has a density of 0.789 g/ml and H2O has a density of 1.0 g/ml. What is the % by volume of ethanol of a solution made by adding 50g of ethanol with 50g of H2O?

Tutor Answer: Use density = mass x volume to convert 50 g ethanol to volume and to convert 50.0 g H2O to volume.
%ethanol v/v = (volume ethanol/total volume?)*100 = ?

MY QUESTION:
i thought that density = m/v

i've done the math and i think you are right because based on the above formula my answer is 126.74%
However, i don't understand why if the density formula is as you stated?

2nd, is this correct?

1/50 = .02, 1/.789 = .01578

(0.01578/0.02) x 100 = 78.9%

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