Posted by Tim on Friday, February 26, 2010 at 6:37pm.
Acetone , C3H6), is the main ingredient of nail polish remover. A solution is made up by adding 35.0 ml of acetone (d=0.790g/ml) to 50.0ml of ethyl alchole, C2H6O (d=0.789 g/ml). summing volumes are additive, calculate
(a). the mass percent of acetone in the solution.
Using density, convert mL of each to grams, then sum them to get a total. Then %aceton = (mass acetone/total mass)*100 = ??
(b). the volume percent of ethyl alcohol in the solution.
Sum the volumes to get a total volume. Then %EtOH = (volume EtOH/total volume)*100 = ??
(c). the mole fraction of acetone in the solution.
Convert grams from part a into moles acetone and moles EtOH. Sum moles to get a total moles. Then
mole fraction acetone = (moles acetone/total moles) = ??
Post your work if you get stuck.
a. 41.2%
b. 58.8%
c. 0.358 moles
a.) % mass of acetone= (mass of solute/mass of solute=mass of solvent)100
*to get the mass you must find the mass by getting it in the given density and volume.
=(2.65/27.65+39.45)100
=(27.65/67.1)100
=41.21%
b.) % volume of ethyl alcohol= (volume of ethyl alcohol/total volume)100
=(50/85)100
=58.82%
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