posted by billy bob j .
The bottle of hydrogen peroxide from the store says it is a 3% solution by mass. What is its molal concentration?
3% by mass means 3 g H2O2 and 97 g H2O.
3 g H2O2 = ?? mols. mols =g/molar mass
Then molality = mols/kg solvent. Post your work if you need additional assistance.