What is the molality of a solution containing 4.0 moles of solute in 3.2 kg of solvent? Round to the nearest tenth. Don't forget the units.

Molality is the moles of solute per Kg of solvent. Simply:

m=moles solute/Kg solvent

m = (4.0 moles solute/3.2 Kg solvent)

m=1.25

m=1.3 mol/Kg or 1.3 molal [rounded to nearest tenth]

(FYI - molarity is found by moles of solute divided by liters of solution)