Question 1001501: If the density of a 500.0g H2SO4 solution is 1.84 g/cm^3 what are its molarity, mole fraction, and molality?
Don't know if you can help me. This is the only site I could find. It's chemistry. Do you know of a chemistry site like this one?
Answer by KMST(5328)   (Show Source):
You can put this solution on YOUR website! The website yeahchemistry.com will help you with chemistry questions.
If the solution was 100% sulfuric acid, you would have 500g sulfuric acid and 0g water.
When you buy a bottle of sulfuric acid it would have a label with analysis data,
and it could read "assay = 98.6%", or something like that.
However, you may assume, it is 100%, because 1.84g/mL is the densityof 100% sulfuric acid at  .
(Warmer acid, and/or less concentrated acid has a lower density).
Then,  would give you the number of moles of sulfuric acid.
You can use the density to find the volume of those 500g solution,
 .
Then,  mol/L is the molarity, often written as  , and read as "18.8 molar".
Since  ,  mol/kg is the molality,
which your instructor may express as  or  .
The mole fraction would be
moles acid/{moles acid + moles water) ,
and since we are assuming 0% water,
that molar fraction would be  .
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