posted by ashley .
An aqueous solution contains 2.6 %NaCl by mass. Calculate the molality of the solution.
2.6% NaCl = 2.6 gNaCl in 2.6 g NaCl + 97.4 g H2O.
Convert 2.5 g NaCl to moles.
Convert g H2O to kg H2O.
m = moles/kg solvent. You should get about 0.5 m. Post your work if you get stuck.