Homework Help: chemistry

Posted by ben on Tuesday, March 19, 2013 at 4:52pm.

What is the percent by volume (% v/v) of a solution made by mixing 12 ml of ethanol (C2H5OH) with 48 ml of water?
b) Assuming the density of ethanol is 0.789g/ml, what is the molarity of this solution?

chemistry - DrBob222, Tuesday, March 19, 2013 at 6:15pm
Assuming 12 mL ethanol + 48 mL H2O = 60 mL (not a true assumption),
(12 mL/60)*100 = ?

b. 12 mL ethanol has a mass of
m = volume x density = 12*0.789 = about 9.46 g convert to mols = g/molar mass = about 0.205 mols. Again, assuming the volume is 60 cc (not true), then M = mol/L soln = 0.205/0.06 = ?

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