- #1
leroyjenkens
- 616
- 49
Homework Statement
Determine the percent sulfuric acid by mass of a 1.49m (molality) aqueous solution of H2SO4.
H2SO4 has a molar mass of about 98 g/mol
Homework Equations
Percent by mass = mass solute / mass solution
Molarity = mol solute / liter of solution
Molality = mol solute / mass solvent (in kg)
The Attempt at a Solution
It doesn't seem like there's enough information. This is practice problem B, so I'm not sure if it wants me to use information from practice problem A or not. On the last page, I used information from A to solve B and got the wrong answer, so I don't think we need any information from A. It just seems like any equation arrangement I make, I have 2 unknowns.
1.49 = mol solute / kg solv
2 unknowns
% by mass = mass solute / mass solution * 100
There's 3 unknowns in this one. What other equations are there that I could use?
And do I have to assume a volume of the solution for this? Like 1 liter?
Thanks.