Calculate the molality of a 2.50 molarity NaCl solution. Density of solution = 1.08 g/ml.

Answer 1

Density = 1.08 g/mL.
1000 mL has a mass of
1000 mL x 1.08 mL = 1080 grams.
2.50 moles NaCl has what mass?
2.50 x 58.5 (you need to be more accurate--this is just a quick guess) = 146 grams.
What is the mass of the water?
1080 mass water + 2.50 moles NaCl.
-146 g NaCl
difference is 934 g H2O.
So molality = 2.50 mols/0.934 kg solvnt = 2.68 m.
Check my thinking.Check my arithmetic.

Answer 2

I believe the density of water is 1 g/ml