1. The problem statement, all variables and given/known data 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 2. Relevant equations Percent by mass = mass solute / mass solution Molarity = mol solute / liter of solution Molality = mol solute / mass solvent (in kg) 3. 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.