Molality is the ratio of the moles of a solute to the kilograms of a solvent.
we are given:
number of moles of solute = 4.1 moles
mass of solvent = 4930.5 g = 4.9305 kg
To find molality, use the following equation:
m = moles of solute/kilograms of solvent
m = 4.1 moles/4.9305 kg
m = 0.832 mol/kg