Friday
March 27, 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%

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Chemistry - At 20 degrees C ethanol has a density of 0.789 g/ml and H2O has a ...
chemistry - What is the mass/vol % ethanol in an ethanol-water solution with ...
chemistry - Calculate the molarity and mole fraction of a 2.35 m solution of ...
chemistry - A 52.3 kg sample of ethanol is needed for a reaction. What volume in...
chemistry - What volume of ethanol must be diluted with water to prepare 315 mL ...
Chemistry - What volume of ethanol must be diluted with water to prepare 768 mL ...
Chemistry - What is the mass/ vol% ethanol in an ethanol water solution with ...
Chemistry - Mass of unknown solution=25.671 Mass ethanol =8.243 Assuming that ...
chemistry - Calculate the molarity and mole fraction of acetone in a 1.29 m ...
to dr bob..chemistry - bottle of wine contains 13.1% ethanol by volume. The ...

Members