Question

Calculate the molality of of a sol'n whose density is 1.15 g/ml

Answer 1

Is this a problem you made up or a homework question from class or your text?

Answer 2

oh I'm sorry it's a typo

The question is this:

Calculate the molality of a 0.410 molar aqueous glucose solution whose density is 1.15 g/mol

Answer 3

0.410 M glucose means 0.410 mols glucose/L soln. The molar mass of glucose is approximately 180 g/mol which means 0.410 is 0.410 x 180 = about 74g. (You need to go through all of these estimates and use better values.)
The mass of 1000 mL of the soln is
1.15 g/mL x 1000 = 1150 g which means the mass of the solvent is 1150-74 = ?. Then m = mols/kg solvent.