An aqueous solution of NaCl is marked 10% (w/w). If the density of the solution is 1.071 gmL-1, what is the molality?
Molality (m) = (number of moles of solute)/(mass of solvent in kg)
It is defined as the number of moles of solute present in 1 kg of solvent. It is denoted by m.
Weight of salute = 10g
Moles of salute =10/58.5 (Weight/Molecular weight)
Weight of solvent = 90 g